Skip to search results
loaded 518 results
Underwear
(518 products)Products (518)
Filter
- Snowsports (334)
- Downhill Skiing (334)
- Skiing (334)
- Snowboarding (334)
- Snow Clothing (332)
- Women's Clothing (296)
- Women's Underwear (296)
- Women's Shirts (114)
- Women's Tops (114)
- Men's Clothing (174)
- Men's Underwear (174)
- Men's Shirts (76)
- Men's Tops (76)
- Fitness (88)
- Cycling (24)
- Cycling Clothing (24)
- Kids' Clothing (24)
- Kids' Underwear (24)
- Kids' Shirts (14)
- Watersports (1)
- Paddling Clothing (1)
- Men's (185)
- Women's (308)
- Boys' (20)
- Girls' (20)
- Kids' (20)
- Toddler Boys' (4)
- Toddler Girls' (4)
- Toddlers' (4)
- Infant Boys' (3)
- Infant Girls' (3)
- Infants' (3)
- Ultralightweight (16)
- Lightweight (118)
- Midweight (145)
- Heavyweight (47)
- Wool (57)
- Wool / Wool Blend (233)
- Cotton / Cotton Blend (13)
- Polyester / Polyester Blend (186)
- Nylon / Nylon Blend (57)
- Rayon / Rayon Blend (30)
- Synthetic Blend (1)
- XXS (24)
- XS (241)
- Small (354)
- Medium (328)
- Large (328)
- XL (324)
- 2XL (154)
- 3XL (26)
- 4XL (2)
- 1X (31)
- 2X (37)
- 3X (36)
- 4X (8)
- 6 Months (1)
- 12 Months (5)
- 18 Months (5)
- 2T (4)
- 3T (4)
- 4T (4)
- 0 (3)
- 2 (6)
- 4 (7)
- 5 (2)
- 6 (9)
- 8 (15)
- 10 (15)
- 12 (13)
- 14 (10)
- 16 (7)
- 18W (4)
- 34 C (3)
- 36 C (4)
- 38 C (4)
- 32 D (7)
- 34 D (4)
- 36 D (4)
- 38 D (5)
- 40 D (4)
- 34 DD (4)
- 36 DD (4)
- 38 DD (4)
- 30 A/B (1)
- 30 C/D (1)
- 32 A/B (1)
- 32 B (1)
- 32 C (4)
- 32 C/D (1)
- 32 DD (6)
- 32 DD/E (1)
- 32 E (4)
- 32 F (4)
- 32 FF (3)
- 32 G (1)
- 32 GG (3)
- 32 H (3)
- 32 HH (1)
- 32 J (1)
- 34 A/B (1)
- 34 B (1)
- 34 C/D (1)
- 34 DD/E (1)
- 34 E (3)
- 34 F (4)
- 34 FF (3)
- 34 G (2)
- 34 GG (1)
- 34 H (1)
- 34 HH (1)
- 34 J (1)
- 36 A/B (1)
- 36 B (1)
- 36 C/D (1)
- 36 DD/E (1)
- 36 E (2)
- 36 F (4)
- 36 FF (3)
- 36 G (2)
- 36 GG (3)
- 36 H (2)
- 36 HH (1)
- 38 A/B (1)
- 38 B (1)
- 38 C/D (1)
- 38 DD/E (1)
- 38 E (4)
- 38 F (4)
- 38 FF (3)
- 38 G (3)
- 38 GG (3)
- 38 H (2)
- 40 A/B (1)
- 40 B (1)
- 40 C (2)
- 40 C/D (1)
- 40 DD (5)
- 40 DD/E (1)
- 40 E (4)
- 40 F (4)
- 40 FF (3)
- 40 G (3)
- 40 GG (1)
- L A-Cx (1)
- L C/D (1)
- L D-DD (1)
- M A-C (1)
- M A/B (1)
- M D-DD (1)
- S A-Cx (1)
- S D-DDx (1)
- S DD/F (1)
- XL A-C (1)
- XL C/D (1)
- XL DD/F (1)
- XS A-C (1)
- XS D-DDx (1)
- XS DD/F (1)
- XXS A-C (1)
- XXS C/D (1)
- XXS D-DD (1)
- Arc'teryx (25)
- Icebreaker (55)
- Kari Traa (39)
- Patagonia (22)
- REI Co-op (53)
- Smartwool (62)
- Stance (43)
- adidas (2)
- ALWRLD (1)
- Arc'teryx (25)
- Arms of Andes (11)
- Artilect (10)
- Beyond Yoga (7)
- Boody Eco Wear (8)
- Brooks (6)
- Burton (5)
- Cotopaxi (1)
- Craft (8)
- Endura (3)
- Fishe (1)
- Free Country (10)
- Free Fly (1)
- Glyder (3)
- Halfdays (2)
- Helly Hansen (16)
- Icebreaker (55)
- Janji (1)
- Kari Traa (39)
- Mons Royale (2)
- Mountain Hardwear (2)
- Nani Swimwear (2)
- Nike (3)
- NRS (1)
- Oiselle (4)
- On (2)
- Ortovox (8)
- Outdoor Research (3)
- Oya Femtech Apparel (2)
- Panache Sport (3)
- Patagonia (22)
- PEARL iZUMi (3)
- Picture Organic Clothing (1)
- prAna (12)
- PYNRS (1)
- rabbit (1)
- REI Co-op (53)
- RHONE (1)
- RONHILL (4)
- Royal Robbins (6)
- Saalt (1)
- Salomon (1)
- Saxx (5)
- Seirus (3)
- SHREDLY (1)
- Smartwool (62)
- Sprayway (4)
- Stance (43)
- Sweaty Betty (2)
- tasc Performance (4)
- Terramar (10)
- Terry (2)
- The North Face (6)
- Threads 4 Thought (5)
- Vuori (3)
- Wild Rye (5)
- Zoic (10)
- Moisture Wicking (358)
- Quick Drying (271)
- Merino Wool (222)
- Top Rated (104)
- Sun-Protective Fabric (69)
- Thumbholes (46)
- New Arrivals (38)
- Adjustable Straps (22)
- Back Closure (10)
- Made in USA (7)
- Underwire (2)
- T-shirt (134)
- Full-zip (4)
- Partial-zip (60)
- Mock / Turtleneck (9)
- Solid (231)
- Novelty (22)
- Print (12)
- Colorblock (9)
- Striped (9)
- Graphic (8)
- Camouflage (2)
- Floral (2)
- Deals (429)
- Multisport (293)
- Fitness (80)
- Casual (54)
- Snowsports (54)
- Running (50)
- Hiking (19)
- Mountain Biking (17)
- Yoga (16)
- Cycling (5)
- Snowboarding (2)
- Backcountry Skiing (1)
- Bike Commuting (1)
- Paddling (1)
- Recreational Cycling (1)
- Road Cycling (1)
- Recycled Materials (118)
- Fair Trade (77)
- bluesign (66)
- Climate Neutral Certified (61)
- Responsibly Sourced Wool (48)
- Organic Fibers (1)
- Sleeveless (2)
- Short Sleeve (20)
- Long Sleeve (185)
- $0.00 to $9.99 (1)
- $10.00 to $19.99 (37)
- $20.00 to $49.99 (193)
- $50.00 to $99.99 (257)
- $100.00 to $199.99 (55)
Sort: Best Match
View:
- IcebreakerMerino 200 Oasis Base Layer Leggings - Kids'$41.93Save 30%compared to  $60.00(6)6 reviews with an average rating of 3.8 out of 5 stars
- Wild RyeEvie Raglan Base Layer Top - Women'sTop Rated$61.83Save 50%compared to  $125.00(11)11 reviews with an average rating of 4.7 out of 5 stars
- ZoicKids Komfy Bike Short Liners - Kids'$14.83Save 50%compared to  $30.00(4)4 reviews with an average rating of 4.8 out of 5 stars
- Arc'teryxRho Heavyweight Base Layer Bottoms - Men'sTop Rated$84.83Save 29%compared to  $120.00(62)62 reviews with an average rating of 4.7 out of 5 stars
- Nani SwimwearUinta Base Layer Bottoms - Women'sTop Rated$36.83Save 50%compared to  $75.00(5)5 reviews with an average rating of 5.0 out of 5 stars
- Nani SwimwearUinta Base Layer Top - Women'sTop Rated$39.83Save 50%compared to  $80.00(10)10 reviews with an average rating of 4.5 out of 5 stars
- PatagoniaCapilene Midweight Base Layer Bottoms - Kids'$26.93Save 30%compared to  $39.00(5)5 reviews with an average rating of 2.4 out of 5 stars
- Picture Organic ClothingNangha Base Layer Top - Men's$44.83Save 50%compared to  $90.00(0)0 reviews
511–518 of 518 products
Sort: Best Match
Related Expert Advice articles
Whether you're working out, hitting the trail, or just enjoying a relaxing day, the perfect underwear is critical. We've rounded up our favorites!
Your choice of underwear can have a big impact on your comfort while hiking. Learn what fabric, style, fit and features to look for.
What material is best?
Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.
Match the temp to the trek
Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.
Find your fit
To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.
Learn about clothes that can help you hike more comfortably, and get strategies for cutting the weight and bulk of clothing in your pack.
Learn which clothes to bring backpacking in order to keep your pack light while making sure you'll have everything you need.
Learn the basics of layering clothing so you can stay comfortable outdoors. Find out how to use base layers, middle layers and outer layers to stay comfortable and active.