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Women's Base Layer Tops
(110 products)Products (110)
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- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's$53.83 - $100.00Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$68.83 - $125.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women'sTop Rated$44.95Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMidweight Long-Sleeve Base Layer Top - Women's$54.95Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women'sTop Rated$71.83 - $130.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Half-Zip Top - Women's$59.95Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women'sTop Rated$51.83 - $104.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's$77.83 - $150.00Underwear Weight:MidweightSize Type:Regular
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's$79.95Underwear Weight:LightweightSize Type:Regular
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women'sTop Rated$51.83 - $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's$49.83 - $99.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- PatagoniaCapilene Midweight Crew Base Layer Top - Women'sTop Rated$49.83 - $89.00Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino T-Shirt - Women's$95.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMerino 185 Base Layer Top - Women's$69.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opLightweight Half-Zip Base Layer Top - Women'sTop Rated$49.95Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women'sTop Rated$69.73Save 26%compared to  $95.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes$29.83Save 57%compared to  $69.95Underwear Weight:LightweightSize Type:Plus
- REI Co-opLightweight Crew Base Layer Top - Women'sTop Rated$34.95Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Women's$77.83Save 40%compared to  $130.00Underwear Weight:MidweightSize Type:Regular
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus SizesTop Rated$39.83Save 50%compared to  $79.95Underwear Weight:LightweightSize Type:Plus
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Terms apply- Arc'teryxRho Hoody Base Layer Top - Women'sTop Rated$140.00Add to cart to see priceUnderwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's$83.83 - $140.00Underwear Weight:MidweightSize Type:Regular
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$89.95Underwear Weight:LightweightSize Type:Regular
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$81.73 - $84.73Save 26% - 28%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenHH Durawool Base Layer T-Shirt - Women's$56.73Save 29%compared to  $80.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- tasc PerformanceElevation Merino T-Shirt - Women's$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Kari TraaRose Half-Zip Base Layer Top - Women's$69.83 - $140.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaEdith Half-Zip Base Layer Top - Women'sTop Rated$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Base Layer Top - Women's$59.83 - $120.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$49.83 - $99.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Half-Zip Base Layer Hoodie - Women'sNew arrival$108.73Save 25%compared to  $145.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaAnna Half-Zip Base Layer Top - Women's$59.83 - $120.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's$44.83 - $90.00Underwear Weight:UltralightweightSize Type:Regular
- SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women'sTop Rated$105.00Size Type:Regular
- Icebreaker125 Cool-Lite Merino Blend Sphere III Scoop T-Shirt - Women's$90.00Underwear Weight:LightweightSize Type:Regular
- Sale Ends Apr 5ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$66.73Save 60%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$39.83Save 55%compared to  $89.95Underwear Weight:LightweightSize Type:Plus
- Arc'teryxRho Zip-Neck Base Layer Top - Women'sTop Rated$120.00Underwear Weight:LightweightSize Type:Regular, Plus
- Sale Ends Apr 5ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Women's$60.73Save 62%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$63.73Save 35%compared to  $99.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's$49.93 - $115.00Underwear Weight:HeavyweightSize Type:Regular
- Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$115.00 - $130.00Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino Base Layer Long-Sleeve Shirt - Women's$66.73Save 25%compared to  $90.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaSmekker Half-Zip Base Layer Top - Women's$140.00Underwear Weight:LightweightSize Type:Regular
- SENIQWool Sculpt Merino Mock-Neck Long-Sleeve Base Layer Shirt - Women's$99.93 - $128.00Underwear Weight:HeavyweightSize Type:Regular
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Women's$84.73Save 26%compared to  $115.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Arc'teryxLana Merino Wool Base Layer Tank Top - Women's$80.00Underwear Weight:LightweightSize Type:Regular, Plus
- Kari TraaSmekker Half-Zip Base Layer Top - Women's$89.73Save 30%compared to  $130.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ColumbiaMidweight Stretch Long-Sleeve Base Layer Top - Women'sTop Rated$39.93Save 27%compared to  $55.00Underwear Weight:MidweightSize Type:Plus
- Black DiamondSolution 150 Merino Base Layer Crew Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Max Merino Quarter-Zip Base Layer Top - Women's$115.73Save 25%compared to  $155.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- HalfdaysJohnson Base Layer Top - Women's$46.83Save 50%compared to  $95.00Underwear Weight:UltralightweightSize Type:Regular
- SmartwoolIntraknit AS Merino Base Layer Crew Top - Women's$125.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaLucie Half-Zip Base Layer Top - Women's$66.73Save 25%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Helly HansenHH Durawool Crew Long-Sleeve Shirt - Women's$64.73Save 28%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's$93.73Save 25%compared to  $125.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$125.00 - $140.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- IcebreakerSiren Sweetheart Long Underwear Top - Women's$85.00Underwear Weight:LightweightSize Type:Regular
- Kari TraaRose Light Base Layer Top - Women's$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Mock Neck Base Layer Top - Women'sNew arrival$104.73Save 25%compared to  $140.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Thermal Weight Zip-Neck Base Layer Top - Women's$69.73Save 36%compared to  $109.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- HalfdaysFay Midweight Merino Base Layer Top - Women's$64.83 - $130.00Underwear Weight:MidweightSize Type:Regular
- Free CountryMicrotech Heat Cocarber Base Layer Top - Women'sTop Rated$39.73Save 33%compared to  $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- PatagoniaCapilene Midweight Crew Base Layer Top - Kids'$28.73Save 26%compared to  $39.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaEmbla Wool Base Layer T-Shirt - Women's$80.00Underwear Weight:UltralightweightSize Type:Regular
- Arc'teryxLana Merino Wool Crew Base Layer Top - Women's$90.00Underwear Weight:LightweightSize Type:Regular, Plus
- Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's$104.73Save 30%compared to  $150.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's$86.73Save 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$150.00Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Base Layer Crew One-Piece - Women's$250.00Underwear Weight:MidweightSize Type:Regular
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$89.73Save 33%compared to  $135.00Underwear Weight:HeavyweightSize Type:PlusREI OUTLET
- SmartwoolIntraknit Thermal Merino Base Layer Hoodie - Women's$107.83 - $119.93Save 33% - 40%compared to  $180.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaAlma Half-Zip Base Layer Top - Women's$100.00Underwear Weight:UltralightweightSize Type:Regular
- Kari TraaFierce Long-Sleeve Base Layer Top - Women's$46.73Save 29%compared to  $66.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Max Merino Base Layer Pattern Hoodie - Women's$114.73Save 30%compared to  $165.00Size Type:RegularREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Crew Base Layer - Women's$79.73Save 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's$34.73Save 30%compared to  $50.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaFryd Long-Sleeve Base Layer Top - Women's$49.73Save 23%compared to  $65.00Underwear Weight:LightweightSize Type:Plus, RegularREI OUTLET
- Kari TraaSmekker Long-Sleeve Base Layer Top - Women's$89.73Save 25%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Kari TraaSilja Half-Zip 2.0 Base Layer Top - Women's$83.93Save 30%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular
- Helly HansenHH LIFA Crew Base Layer Top - Women's$50.00Underwear Weight:LightweightSize Type:Regular
- IcebreakerMerino 200 Oasis Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$84.73Save 26%compared to  $115.00Underwear Weight:MidweightSize Type:PlusREI OUTLET
- PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Women's$99.00Underwear Weight:HeavyweightSize Type:Regular
- SpraywayEffra Hoody Base Layer Top - Women's$49.73Save 28%compared to  $69.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Women's$56.83 - $66.83Save 50%compared to  $115.00 - $135.00Underwear Weight:LightweightSize Type:Regular
- CraftCORE Dry Active Comfort Base Layer Top - Women's$39.73Save 38%compared to  $64.95Underwear Weight:MidweightSize Type:RegularREI OUTLET
1–90 of 110 products
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