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- Kari TraaFryd Base Layer Pants - Women's$40.73Save 25% - 32%compared to  $55.00 - $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Helly HansenLifa Merino Midweight Base Layer Pants - Men's$69.93Save 33%compared to  $105.00Underwear Weight:MidweightSize Type:Big
- Terramar3.0 Thermawool Base Layer Tights - Women's$44.73Save 36%compared to  $70.00Underwear Weight:MidweightSize 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
- IcebreakerMerino 200 Oasis Base Layer Leggings - Women's$61.83Save 50%compared to  $125.00Underwear Weight:MidweightSize Type:Regular
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$63.73Save 35%compared to  $99.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaAlma Pants - Women'sNew arrival$68.73Save 23%compared to  $90.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLET
- Arc'teryxRho Hybrid Insulated Base Layer Bottoms - Women'sTop Rated$143.73Save 20%compared to  $180.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Terramar1.0 All-Season Lightweight Merino Wool T-Shirt - Women's$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize 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
- Helly HansenLifa Merino Midweight Base Layer Half-Zip Top - Women's$79.93 - $110.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Men'sTop Rated$84.73Save 26%compared to  $115.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Kari TraaSmekker Half-Zip Base Layer Top - Women's$89.73Save 30%compared to  $130.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Wild RyeBassett LITE Base Layer Leggings - Women's$59.83Save 32%compared to  $89.00Underwear Weight:LightweightSize Type:Regular, Plus
- ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Women's$81.73Save 48%compared to  $160.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- CraftCORE Dry Active Comfort Base Layer Top - Women's$39.73Save 38%compared to  $64.95Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Wild RyeBassett Half-Zip Base Layer Top - Women's$89.83Save 33%compared to  $135.00Underwear Weight:MidweightSize Type:Regular
- SpraywayEffra Jacket Base Layer Top - Women's$42.73Save 34%compared to  $64.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Sonebula Long-Sleeve Crewe Base Layer Top - Men'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- KUHLReactiv Lite Grid Base Layer Bottoms - Women's$48.83Save 50%compared to  $99.00Underwear Weight:LightweightSize Type:Regular
- Free CountryMicrotech Heat Cocarber Base Layer Bottoms - Women's$39.73Save 33%compared to  $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Kari TraaRose Long-Sleeve Base Layer Top - Women's$79.73Save 27%compared to  $110.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- SpraywayEffra Crew Base Layer Top - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- The North FaceSummit Series Pro 120 Base Layer Tights - Women's$54.83Save 50%compared to  $110.00Underwear Weight:UltralightweightSize Type:Regular
- Arc'teryxKyanite Base Layer Bottoms - Women'sTop Rated$96.73Save 19%compared to  $120.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Outdoor ResearchAlpine Onset Merino 150 Crew Base Layer Top - Men's$59.93Save 39%compared to  $99.00Underwear Weight:LightweightSize Type:Regular
- Free CountryMicrotech Heat Cocarber Base Layer Top - Women'sTop Rated$39.73Save 33%compared to  $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Black DiamondSolution 150 Merino Base Layer Crew Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's$84.73Save 50%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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