Ultra Marathon Apparel
& Running Clothing
Dress for comfort, performance, and survival across any distance and conditions.
The right apparel system isn't about brand loyalty — it's about matching fabric, weight, and layering to your specific race conditions. A poorly chosen shirt can end a 100-mile race through chafing alone. The wrong insulation layer can cause hypothermia on a mountain at 2am. Get this right.
Build Your Race Outfit
5 questions → a complete layering recommendation with specific products.
Outfit Finder
5 questions → a complete outfit recommendation for your race.
Question 1 of 5
What's your race distance?
Base Layers — Tops
Your first line of defense against sweat, sun, and cold
The shirt touching your skin determines everything: blister prevention at the underarms, temperature regulation, and whether you smell like a human being at mile 80. Cotton is never the answer.
Patagonia
Capilene Cool Daily Shirt
Material: Recycled polyester with Polygiene treatment
Fit: Men's & Women's
Best for
Pros
- +UPF 50+ sun protection built into fabric
- +Polygiene odor control — stays fresh for days
- +Ultralight and fast-drying
Cons
- −Not warm enough for cool mornings
- −Synthetic odor can build over multiple long runs
- −Plain aesthetic
Salomon
Sense Aero Tee
Material: 37.5 technology polyester
Fit: Men's & Women's
Best for
Pros
- +37.5 technology actively moves moisture at a cellular level
- +Seamless construction eliminates underarm chafe points
- +Motion-fit design moves with you on technical terrain
Cons
- −Salomon sizing runs European/slim — size up
- −Limited color options
- −Higher price for a single technical tee
Smartwool
Merino 150 Short Sleeve
Material: Merino wool blend
Fit: Men's & Women's
Best for
Pros
- +Wearable for multiple days without washing — odor resistance is real
- +Natural temperature regulation works both ways (cool in heat, warm when cool)
- +Naturally moisture-wicking without synthetic chemicals
Cons
- −More expensive than synthetic options
- −Slower to dry than polyester
- −Requires more careful washing
Smartwool
Merino 250 Base Layer Crew
Material: 100% Merino wool
Fit: Men's & Women's
Best for
Pros
- +Heavyweight merino provides real insulating warmth
- +Breathes during exertion — doesn't trap heat like synthetics
- +Odor-resistant for multi-day events
Cons
- −Too warm for anything above 50°F at race pace
- −Premium price point
- −Requires careful washing
Outdoor Research
Echo Long Sleeve
Material: Recycled polyester
Fit: Men's & Women's
Best for
Pros
- +Thumbholes keep sleeves down on long descents
- +Best value long-sleeve performance shirt available
- +UPF 30+ sun protection
Cons
- −Not as technical as Salomon or Patagonia options
- −Average odor control
- −Somewhat loose fit
Shorts & Bottoms
Chafe prevention and pocket access define your race
The wrong shorts will sideline you with chafing by mile 30. The right ones carry your nutrition, stay in place, and feel like nothing after 100 miles. Liner, pocket count, and inseam are everything.
Patagonia
Strider Pro Shorts 5"
Material: Recycled nylon ripstop
Fit: Men's & Women's
Best for
Pros
- +DWR finish handles light rain and stream crossings
- +Built-in liner eliminates need for separate underwear
- +Secure back pocket fits gels and phone
Cons
- −Only 2 pockets — not enough for 100-mile nutrition needs
- −Thin liner isn't for everyone
- −Limited color options
Janji
5" AFO Middle Short
Material: 4-way stretch performance fabric
Fit: Men's & Women's
Best for
Pros
- +6 total pockets — enough to carry a full race-day nutrition plan
- +Split hem gives unrestricted stride on technical terrain
- +Performance liner is genuinely comfortable over 100 miles
Cons
- −Higher price for shorts
- −Pocket weight can feel unbalanced when fully loaded
- −Limited inseam options
Patagonia
Nine Trails 8" Short
Material: Recycled polyester/nylon blend
Fit: Men's & Women's
Best for
Pros
- +DWR coating handles brush and light rain
- +8" inseam prevents inner thigh chafing
- +Multiple pockets including secure back zip
Cons
- −Heavier than racing-specific shorts
- −Not ideal for speed-focused runners
- −8" can feel warm in peak heat
Patagonia
Capilene Midweight Tights
Material: Recycled polyester
Fit: Men's & Women's
Best for
Pros
- +Moisture-wicking insulating fabric for cold weather base layer
- +Flatlock seams prevent chafing over long efforts
- +Comfortable waistband doesn't dig over 20+ hours
Cons
- −Not warm enough for extreme cold without layering
- −No pockets
- −Can feel restrictive at faster paces
Salomon
Trail Runner Wind Tight
Material: Weather Shield polyester
Fit: Men's & Women's
Best for
Pros
- +Wind-resistant — noticeable difference on exposed ridgelines
- +Reflective details for night visibility
- +Storage pockets on thigh and back
Cons
- −Premium price for tights
- −Not as breathable as non-windproof options
- −Salomon sizing runs slim
Insulation & Mid Layers
Packable warmth that earns its space in your vest
Every layer in your vest costs you space and weight. Insulation needs to earn its place by being compressible, light, and warm when you stop moving. These do all three.
Patagonia
Nano Puff Jacket
Material: PrimaLoft Gold insulation
Fit: Men's & Women's
Best for
Pros
- +PrimaLoft insulates when wet — critical for rain and sweat in cold races
- +Packs into its own pocket — compresses small enough for any running vest
- +Weather-resistant shell keeps wind and light rain out
Cons
- −Premium price
- −Synthetic not as warm-to-weight as high-fill down
- −Gets warm quickly when running hard
Arc'teryx
Atom LT Hoody
Material: Coreloft Compact 60g insulation
Fit: Men's & Women's
Best for
Pros
- +Breathable Tyono panels prevent overheating at pace
- +Helmet-compatible hood works over running hats and headlamps
- +Arc'teryx construction quality is industry-leading
Cons
- −Most expensive option in this category
- −Less packable than Nano Puff
- −Not available in as many colors
Mountain Hardwear
Ghost Whisperer/2
Material: 800-fill responsibly sourced down
Fit: Men's & Women's
Best for
Pros
- +7 oz is the lightest warm jacket in this guide — genuinely remarkable
- +800-fill down is the warmth-to-weight benchmark
- +Compresses to fist-sized — uses essentially zero vest space
Cons
- −Loses insulation value when wet — risky in rain-prone races
- −Premium price for a single jacket
- −Delicate fabric tears easily
Patagonia
R1 Hoody
Material: Polartec Power Stretch grid fleece
Fit: Men's & Women's
Best for
Pros
- +Most breathable insulation layer available — designed for active use
- +Grid fleece interior wicks moisture away from base layer
- +Hood adds versatility without excessive bulk
Cons
- −Not designed to stop wind or rain — needs a shell over it
- −Less packable than insulated jackets
- −Limited warmth in extreme cold
Rain & Wind Shells
Mandatory gear that must perform when conditions turn
Many races mandate a waterproof jacket. Even when they don't, a shell is non-negotiable for 100-mile mountain races. Weight and packability determine whether runners actually carry it vs. leave it at camp.
Outdoor Research
Helium Rain Jacket
Material: Pertex Shield waterproof membrane
Fit: Men's & Women's
Best for
Pros
- +6.4oz is genuinely ultralight at this price point
- +Packs into its own chest pocket — attached stuff sack
- +Meets most race mandatory gear requirements
Cons
- −Less breathable than Gore-Tex alternatives
- −Durability lower than premium options
- −Limited feature set
Patagonia
Storm Racer Jacket
Material: H2No 2.5-layer waterproof membrane
Fit: Men's & Women's
Best for
Pros
- +H2No membrane balances waterproofing and breathability better than most
- +Trail-running cut — helmet hood, motion-fit arms
- +Adjustable hem and hood without stopping
Cons
- −More expensive than Helium
- −Some find H2No less breathable than eVent
- −Hood can obstruct peripheral vision
Arc'teryx
Norvan SL Hoody
Material: Gore-Tex Shakedry
Fit: Men's & Women's
Best for
Pros
- +4.7oz — lightest waterproof shell in trail running
- +Gore-Tex Shakedry never wets out — water rolls off instantly
- +Rolls into its own hood — takes almost no vest space
Cons
- −$299 is a serious investment for a jacket
- −Shakedry fabric is delicate — not for bushwhacking
- −No chest pockets
Salomon
Bonatti WP Jacket
Material: AdvancedSkin Dry waterproof membrane
Fit: Men's & Women's
Best for
Pros
- +Most affordable waterproof jacket that genuinely works
- +Motion Fit construction allows full arm movement
- +Packs into side pocket for easy access
Cons
- −AdvancedSkin Dry less breathable than Gore-Tex
- −Heavier than ultralight options
- −Salomon sizing runs slim
Patagonia
Houdini Jacket
Material: Nylon ripstop with DWR
Fit: Men's & Women's
Best for
Pros
- +3.8oz packs into its own chest pocket
- +The definitive packable wind shell
- +DWR handles light rain for 20–30 minutes
Cons
- −Not a true waterproof jacket — won't survive sustained rain
- −Best paired with waterproof shell in the vest
- −DWR wears off and requires reapplication
Socks
The most important piece of apparel per dollar spent
Blisters end more races than bonking. The right socks, sized correctly and worn with race shoes, are the difference between walking mile 70 and running it. Never scrimp here.
Darn Tough
Run No-Show Tab Lightweight
Material: Merino wool + nylon
Fit: Men's & Women's
Best for
Pros
- +Lifetime warranty — Darn Tough replaces any sock that wears out, ever
- +Merino wool manages moisture and odor naturally
- +Seamless toe construction eliminates the #1 blister cause
Cons
- −Premium price for socks
- −Takes a few washes to fully break in
- −Merino less durable than pure synthetics over many years
Feetures
Elite Max Cushion No Show
Material: Nylon + spandex
Fit: Men's & Women's
Best for
Pros
- +Anatomical left/right design — genuinely fits better than ambidextrous socks
- +Targeted compression in arch and heel prevents slippage
- +Lifetime guarantee from Feetures
Cons
- −Synthetic-only — less odor-resistant than merino options
- −Max cushion can feel too warm in heat
- −No tab for Achilles protection
Balega
Hidden Comfort No Show
Material: Mohair + synthetic blend
Fit: Men's & Women's
Best for
Pros
- +Best value sock in this guide — $14 with quality construction
- +Deep heel pocket prevents sock slippage
- +Hand-linked seamless toe is genuinely comfortable
Cons
- −No lifetime guarantee
- −Less blister-resistant than Darn Tough or Feetures
- −Mohair can pill over time
Injinji
Run Lightweight No-Show Tab
Material: CoolMax + nylon
Fit: Men's & Women's
Best for
Pros
- +Individual toe sleeves eliminate all toe-to-toe blister contact
- +Perfect for wide toe box shoes (Altra, Topo)
- +CoolMax manages moisture efficiently
Cons
- −Toe sleeves require time to put on (harder at mile 60 aid station)
- −Unusual feel requires adaptation period
- −Not for narrow-fit shoes
Smartwool
PhD Run Light Elite Micro
Material: Merino wool + nylon
Fit: Men's & Women's
Best for
Pros
- +4 Degree fit system targets comfort across the foot
- +Merino's natural temperature regulation works in both heat and cool
- +Smartwool quality construction lasts multiple seasons
Cons
- −Premium price
- −Smartwool's warranty less comprehensive than Darn Tough
- −Merino slower to dry than synthetic options
Hats, Gloves & Accessories
Small items with outsized impact on comfort and safety
Accessories are where races are lost to cold hands, eye strain, and neck exposure. They weigh almost nothing in your vest but matter enormously when conditions change.
Salomon
XA Cap
Material: Lightweight mesh
Fit: Unisex
Best for
Pros
- +Featherlight construction — barely know it's there
- +UPF 30+ protection
- +Moisture-wicking sweatband
Cons
- −Limited brim for serious sun protection
- −Less structured than some prefer
- −Not for cold weather
Ciele
GOCap
Material: COOLwick fabric
Fit: Unisex
Best for
Pros
- +COOLwick technology actively manages sweat
- +Technical running-specific cut
- +Best overall running cap aesthetic
Cons
- −Higher price for a cap
- −Less ventilation than mesh alternatives
- −Limited brim
Smartwool
Merino 250 Beanie
Material: Merino wool
Fit: Unisex
Best for
Pros
- +Merino warmth without synthetic bulk
- +Odor-resistant for multi-day events
- +Fits under headlamp and hydration vest hoods
Cons
- −Too warm for moderate conditions
- −Slower drying than synthetic beanies
- −Can shift under headlamp
Buff
Original Multifunctional Headwear
Material: Microfiber polyester
Fit: Unisex
Best for
Pros
- +12+ wearing configurations — beanie, neck gaiter, bandana, face mask
- +Essential piece at $20 — buy three
- +UPF 50+ in standard fabric
Cons
- −Minimal insulation in standard version
- −Can slip when worn as hat
- −Limited warmth in cold conditions (Merino version needed for cold)
Smartwool
Merino 150 Gloves
Material: Merino wool + nylon
Fit: Unisex
Best for
Pros
- +Touchscreen compatible — operate your watch without removing gloves
- +Merino regulates temperature — comfortable from 25–50°F at running pace
- +Odor-resistant for multi-day events
Cons
- −Not warm enough for extreme cold (below 20°F) without overmitts
- −Merino wears faster than synthetic gloves
- −No wind protection
Goodr
Goodr Running Sunglasses
Material: Lightweight frames, polarized lens
Fit: Unisex
Best for
Pros
- +No-bounce design engineered specifically for running
- +Polarized at $25 — unmatched value
- +Dozens of fun color options
Cons
- −Less durable than Oakley or Tifosi
- −Limited field of view vs. wrap-around styles
- −Not ideal for truly technical terrain where full protection matters
Oakley
Radar EV Path
Material: O-Matter frame, Prizm lens
Fit: Unisex
Best for
Pros
- +Prizm lens technology optimizes contrast for trail surfaces
- +Large lens provides maximum field of view for trail obstacles
- +Secure fit stays put during technical running
Cons
- −Most expensive sunglasses in this guide
- −Can fog in humid conditions
- −Premium target for theft at aid stations
Salomon
Trail Gaiters Low
Material: Breathable nylon
Fit: Unisex
Best for
Pros
- +Keeps rocks, sand, and pine needles out of shoes
- +Compatible with Salomon shoe attachment system
- +Breathable — you won't notice them after mile 1
Cons
- −Requires compatible shoes (attachment tabs)
- −Low-cut doesn't help with deep mud
- −Extra step in race prep
Anti-Chafe & Undergarments
The unsexy products that save your race
Chafing is entirely preventable and absolutely race-ending. Apply before you start, reapply at crew stops, and carry it in your vest. These products cost pennies per mile of comfort.
Body Glide
Original Anti-Chafe Balm
Material: Plant-derived, non-greasy
Fit: Unisex
Best for
Pros
- +The industry standard — used by more ultra runners than any other anti-chafe
- +Non-greasy stick applicator is fast and clean
- +Plant-based formula safe for sensitive skin
Cons
- −Needs reapplication at 50M+ for some runners
- −Stick format can be awkward for inner thighs
- −Can transfer to clothing
Squirrel's
Nut Butter
Material: All-natural oils and butters
Fit: Unisex
Best for
Pros
- +All-natural ingredients — no synthetic chemicals on skin for 30 hours
- +Cream formula covers large areas faster than sticks
- +Superior waterproofing — stays on through 10+ hours of sweating
Cons
- −More expensive than Body Glide
- −Cream can feel greasy initially
- −Packaging less convenient than a stick
2Toms
SportShield Roll-On
Material: Silicone-based formula
Fit: Unisex
Best for
Pros
- +Roll-on applicator reaches everywhere — especially the back
- +Silicone base is extremely durable and water-resistant
- +No residue on clothing
Cons
- −Silicone-based — some prefer natural alternatives
- −Roll-on can take longer than stick to apply
- −Less widely available than Body Glide
ExOfficio
Give-N-Go Boxer Brief
Material: Nylon/elastane blend
Fit: Men's
Best for
Pros
- +Quick-dry nylon dries within hours even without removing
- +Antimicrobial treatment prevents bacterial chafing
- +Ultra-favorite for 100-mile events with shorts that have thin liners
Cons
- −Extra layer adds warmth in heat
- −Not necessary with shorts that have good liners
- −Needs washing after every use
Layering by Conditions
The layering system that keeps you comfortable from a summer desert 50K to a winter mountain 100-miler.
Hot (75°F+)
~$165 estimated
Start with ice in your hat and bandana. Apply sunscreen AND SPF lip balm.
Moderate (50–75°F)
~$320 estimated
Moderate days change — morning cold, afternoon warm. Layer for the start, not the peak.
Cool (35–50°F)
~$380 estimated
The vest goes in your pack when you warm up — arms free, core warm.
Cold (20–35°F)
~$500 estimated
Your biggest cold-weather mistake: not having a dry base layer in your drop bag.
Wet / Rainy
~$350+ estimated
Extra dry socks in your vest. Wet feet are inevitable — dry socks reset you.
Mountain / Alpine
~$600+ estimated
Mountain races: all layers accessible in vest top pocket. Never dig for emergency gear.
Fabric Technology Guide
Know what you're buying. These are the technologies that actually matter over 100 miles.
Base Fabrics
Merino Wool
Temperature regulating, odor-resistant, naturally moisture-wicking. Slower to dry than synthetic. Best for multi-day events.
Polyester
Fast-drying, durable, affordable. Retains odor over time. Nike Dri-FIT, Patagonia Capilene.
Nylon
Softer feel than polyester, more durable, excellent moisture management. Patagonia's preferred synthetic.
Merino Blends
Best of both: wool odor resistance + synthetic durability and drying speed. Smartwool PhD line.
Insulation Tech
Down (800+ fill)
Best warmth-to-weight ratio. Loses insulation when wet. Best for dry cold. Mountain Hardwear Ghost Whisperer.
PrimaLoft / Coreloft
Synthetic insulation that works when wet. More durable than down. Patagonia Nano Puff, Arc'teryx Atom.
Polartec Fleece
Breathable active insulation. Grid interior wicks moisture. Best mid-layer for running. Patagonia R1.
37.5 Technology
Active particles in fiber move moisture and maintain optimal body temp. Salomon uses extensively.
Weather Membranes
Gore-Tex
Gold standard waterproof-breathable. Expensive, durable, widely trusted. Arc'teryx Beta LT.
Gore-Tex Shakedry
Exposed membrane — lightest waterproof available. Delicate but remarkable. Arc'teryx Norvan SL.
Patagonia H2No
Patagonia's proprietary membrane. Excellent breathability/waterproofing balance at lower price.
DWR Coating
Surface treatment that beads water. Not waterproof — needs shell behind it. Reapply with Nikwax periodically.
Sustainability
Bluesign Approved
Certification for safe, sustainable fabric production. Patagonia, Arc'teryx, Outdoor Research.
Recycled Content
Patagonia's Capilene uses 100% recycled polyester. Performance identical to virgin synthetic.
ZQ Merino
Ethical merino sourcing standard. Animal welfare + land management. Smartwool, Icebreaker.
Polygiene
Antimicrobial treatment that reduces wash frequency — less water, less energy. Patagonia, various brands.
Clothing by Race Distance
Longer races require more clothing redundancy, drop bag planning, and night-section preparation.
50K
4–10 hrs
Race Day Outfit
- →Single full outfit (weather-appropriate)
- →1 layering option in vest
- →Hat, sunglasses, buff
Drop Bags
- ·No drop bags typically needed
- ·Extra sock pair if long course
Test your exact race-day outfit on a 15-20 mile training run first.
50 Miles
7–14 hrs
Race Day Outfit
- →Start outfit
- →1-2 layering options in vest
- →Full accessories kit
Drop Bags
- ·Extra shirt
- ·1-2 extra sock pairs
- ·Warmer layer if evening finish
- ·Fresh hat
Plan for the temperature at your estimated finish time, not the start.
100K
10–20 hrs
Race Day Outfit
- →Day start outfit
- →Night transition layer in vest
- →2-3 layering options accessible
Drop Bags
- ·Mid-race shirt change
- ·2-3 sock pairs
- ·Night running warm kit
- ·Emergency dry base layer
Day-to-night transition is where most clothing mistakes happen. Plan it explicitly.
100 Miles
20–36 hrs
Race Day Outfit
- →Multiple complete outfits
- →Full layering system at all times
- →Night gear must be accessible without stopping
Drop Bags
- ·4-6 fresh sock pairs
- ·3-4 fresh shirts
- ·2 fresh shorts/tights
- ·Full night kit in 50-mile bag
- ·Rain gear at every bag
A fresh shirt and clean socks at mile 70 can save a race psychologically. Include them.
Clothing Care & Longevity
Proper care extends the life of technical apparel by years. These aren't regular clothes.
Washing Rules
- →Cold water always — heat degrades technical fabrics
- →Gentle cycle — tumble damages DWR and stretchy fibers
- →Sport-specific detergent (Nikwax Sport Wash, Sport Suds) — regular detergent clogs moisture-wicking
- →No fabric softener — ever — it destroys wicking properties
- →Turn garments inside out to reduce pilling
- →Zip all zippers before washing
Drying Rules
- →Air dry whenever possible — extends fabric life by years
- →No high heat in dryer — degrades elastic and synthetic fibers
- →Waterproof shells: tumble dry LOW to reactivate DWR coating
- →Down jackets: tumble dry LOW with tennis balls to restore loft
- →Merino wool: lay flat to dry — hanging stretches it
- →Out of direct sunlight — UV degrades many fabrics
DWR Maintenance
- →DWR (water-repellent coating) wears off with use and washing
- →Signs it's gone: jacket 'wets out' and feels heavy in rain
- →Restore by washing and tumble drying — heat reactivates DWR
- →If that fails: apply Nikwax TX.Direct or Granger's spray
- →Reapply every season or when performance drops
- →Never use regular detergent on waterproof shells
Merino Wool Care
- →Wash less frequently — merino can be worn 3-5 times before washing
- →Use wool-specific detergent (Eucalan, Nikwax Wool Wash)
- →Cool water only — warm water causes felting and shrinking
- →Lay flat to dry — never hang or machine dry
- →Pilling is normal — use a fabric shaver to remove
- →Never bleach — destroys wool fiber permanently
When to Replace
- →Fabric has thinned noticeably (hold to light — transparency test)
- →Holes or tears that can't be repaired with seam tape
- →Lost stretch — waistbands, cuffs that no longer grip
- →Persistent odor that washing can't remove (bacterial saturation)
- →Waterproofing can't be restored despite DWR reapplication
- →Seams failing in multiple places
Warranties to Know
- →Darn Tough: Unconditional lifetime warranty — replace any worn-out sock free
- →Patagonia: Ironclad Guarantee — repair, replace, or refund regardless of age
- →Arc'teryx: Lifetime limited warranty on manufacturing defects
- →Feetures: Lifetime guarantee on their performance socks
- →Smartwool: Limited lifetime guarantee on defects
- →Register your gear — warranties require proof of purchase
Frequently Asked Questions
What should I wear for my first ultra?▾
Cotton or synthetic? Is it really that important?▾
Is merino wool worth the extra cost?▾
How do I prevent chafing?▾
Should I wear compression?▾
What do I wear at night?▾
How many pairs of socks should I bring?▾
When should I change clothes during a 100-miler?▾
Can I wear the same outfit for training and racing?▾
How do I dress for variable mountain weather?▾
Affiliate disclosure: FinishUltra may earn a commission on purchases made through links on this page at no additional cost to you. We only recommend gear we've researched and trust for ultra running.