Skip to search results
loaded 634 results
Underwear
(634 products)Products (634)
Filter
- Base Layers (446)
- Base Layer Tops (281)
- Base Layer Bottoms (177)
- Sports Bras (94)
- Women's Sports Bras (94)
- Briefs and Boxers (93)
- Men's Briefs and Boxers (67)
- Union Suits (1)
- Men's Union Suits (1)
- Arc'teryx (23)
- Helly Hansen (32)
- Icebreaker (73)
- Kari Traa (56)
- REI Co-op (59)
- Smartwool (82)
- Stance (46)
- adidas (1)
- ALWRLD (2)
- Arc'teryx (23)
- Arms of Andes (11)
- Artilect (9)
- Beyond Yoga (6)
- Black Diamond (2)
- Boody Eco Wear (8)
- Brooks (6)
- Burton (5)
- Columbia (4)
- Craft (7)
- Deux par Deux (2)
- ExOfficio (12)
- Fishe (1)
- Fjallraven (2)
- Free Country (11)
- Free Fly (1)
- Glyder (3)
- Halfdays (4)
- Helly Hansen (32)
- Hootie Hoo (1)
- Hot Chillys (9)
- Icebreaker (73)
- Janji (2)
- Kari Traa (56)
- KUHL (6)
- Nike (2)
- NRS (1)
- Oiselle (5)
- On (3)
- Ortovox (8)
- Outdoor Research (10)
- Oya Femtech Apparel (1)
- Panache Sport (4)
- Patagonia (19)
- Picture Organic Clothing (1)
- prAna (20)
- PYNRS (1)
- rabbit (1)
- REI Co-op (59)
- RHONE (1)
- RONHILL (4)
- Royal Robbins (3)
- Saxx (11)
- Seirus (2)
- Smartwool (82)
- Sprayway (4)
- Stance (46)
- Stio (4)
- Sweaty Betty (2)
- tasc Performance (4)
- Terramar (11)
- The North Face (11)
- Threads 4 Thought (5)
- TomboyX (1)
- Vuori (3)
- Wild Rye (6)
- XXS (31)
- XS (310)
- Small (485)
- Medium (456)
- Large (448)
- XL (443)
- 0 (6)
- 2 (8)
- 4 (9)
- 5 (3)
- 6 (12)
- 7 (1)
- 8 (20)
- 9 (1)
- 10 (17)
- 12 (19)
- 14 (12)
- 16 (10)
- 12 Months (5)
- 18 Months (5)
- 18W (5)
- 1X (38)
- 2T (6)
- 2X (47)
- 2XL (187)
- 30 A/B (1)
- 30 C/D (1)
- 32 A/B (1)
- 32 B (1)
- 32 C (3)
- 32 C/D (1)
- 32 D (6)
- 32 DD (5)
- 32 DD/E (1)
- 32 E (3)
- 32 F (3)
- 32 FF (3)
- 32 G (3)
- 32 GG (3)
- 32 H (2)
- 32 HH (1)
- 32 J (1)
- 34 A/B (1)
- 34 B (1)
- 34 C (3)
- 34 C/D (1)
- 34 D (5)
- 34 DD (6)
- 34 DD/E (1)
- 34 E (4)
- 34 F (4)
- 34 FF (3)
- 34 G (2)
- 34 GG (2)
- 34 H (2)
- 34 HH (1)
- 34 J (1)
- 36 A/B (1)
- 36 B (1)
- 36 C (4)
- 36 C/D (1)
- 36 D (3)
- 36 DD (8)
- 36 DD/E (1)
- 36 E (3)
- 36 F (5)
- 36 FF (4)
- 36 G (1)
- 36 GG (3)
- 36 H (3)
- 36 HH (1)
- 38 A/B (1)
- 38 B (1)
- 38 C (5)
- 38 C/D (1)
- 38 D (8)
- 38 DD (8)
- 38 DD/E (1)
- 38 E (5)
- 38 F (5)
- 38 FF (3)
- 38 G (4)
- 38 GG (4)
- 38 H (2)
- 3T (7)
- 3X (46)
- 3XL (25)
- 40 A/B (1)
- 40 B (1)
- 40 C (3)
- 40 C/D (1)
- 40 D (7)
- 40 DD (4)
- 40 DD/E (1)
- 40 E (4)
- 40 F (5)
- 40 FF (4)
- 40 G (2)
- 40 GG (1)
- 42 E (1)
- 42 F (1)
- 42 FF (1)
- 4T (8)
- 4X (8)
- 4XL (2)
- 5T (4)
- 5X (1)
- 6T (2)
- 6X (1)
- L A-C (1)
- M A-C (1)
- S A-C (1)
- XL A-C (1)
- XS A-C (1)
- XS D-DD (1)
- XXS A-C (2)
- XXS C/D (1)
- XXS D-DD (1)
- $0.00 to $9.99 (1)
- $10.00 to $19.99 (48)
- $20.00 to $49.99 (185)
- $50.00 to $99.99 (256)
- $100.00 to $199.99 (157)
- $200.00 to $499.99 (6)
- Wool (66)
- Wool / Wool Blend (326)
- Cotton / Cotton Blend (7)
- Nylon / Nylon Blend (63)
- Polyester / Polyester Blend (200)
- Polypropylene / Polypropylene Blend (1)
- Rayon / Rayon Blend (36)
- Synthetic Blend (2)
- Ultralightweight (17)
- Lightweight (148)
- Midweight (214)
- Heavyweight (59)
- Multisport (388)
- Fitness (92)
- Snowsports (77)
- Casual (65)
- Running (45)
- Yoga (27)
- Hiking (18)
- Travel (4)
- Snowboarding (3)
- Backcountry Skiing (1)
- Paddling (1)
- Active Pursuits (1)
- Capilene (15)
- Classic All Season (12)
- Classic Thermal Merino (22)
- Dare (1)
- Everyday (2)
- Groundwork (1)
- Intraknit (31)
- Kyanite (2)
- Maipo (2)
- Merino 185 (15)
- Spacedye (4)
- Sphere (1)
- Summit Series (9)
- Solid (297)
- Novelty (34)
- Print (24)
- Striped (22)
- Colorblock (15)
- Graphic (9)
- Floral (4)
- Camouflage (2)
- Men's (212)
- Women's (377)
- Boys' (38)
- Girls' (38)
- Kids' (38)
- Toddler Boys' (6)
- Toddler Girls' (6)
- Toddlers' (6)
- Infant Boys' (1)
- Infant Girls' (1)
- Infants' (1)
- bluesign (60)
- Climate Label Certified (62)
- Climate Neutral Certified (6)
- Fair Trade (77)
- Recycled Materials (115)
- Responsibly Sourced Wool (63)
- Sleeveless (2)
- Short Sleeve (19)
- Long Sleeve (261)
- Deals (334)
- T-shirt (171)
- Full-zip (4)
- Partial-zip (91)
- Mock / Turtleneck (16)
- Moisture Wicking (442)
- Quick Drying (321)
- Merino Wool (317)
- Top Rated (117)
- Sun-Protective Fabric (93)
- Thumbholes (73)
- New Arrivals (63)
- Adjustable Straps (20)
- Back Closure (9)
- Made in USA (6)
- Underwire (2)
Sort: Best Match
View:
- OnPerformance Bra Lumos$80.00(0)0 reviewsBra Support:Medium ImpactSupport Style:CompressionFabric:75% recycled polyester/25% elastane
- FisheSports Bra$39.73Save 37%compared to  $64.00(0)0 reviewsBra Support:Medium ImpactSupport Style:CompressionFabric:76% polyester/24% spandexREI OUTLET
- prAnaLayna Printed Bra$39.73Save 38%compared to  $65.00(1)1 reviews with an average rating of 1.0 out of 5 starsSupport Style:Compression / EncapsulationFabric:85% recycled polyester/15% LYCRA elastaneREI OUTLET
- TomboyXFull-Zip BraNew arrival$59.00(0)0 reviewsBra Support:High ImpactSupport Style:CompressionFabric:75% recycled nylon/25% spandex
631–634 of 634 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.