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- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$56.83 - $115.00Underwear Weight:MidweightSize Type:Regular, Plus
- tasc PerformanceElevation Merino T-Shirt - Women's$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's$27.93 - $39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- tasc PerformanceElevation Merino Base Layer Bottoms - Women's$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- tasc PerformanceElevation Merino T-Shirt - Men's$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- tasc PerformanceElevation Merino Base Layer Bottoms - Men's$34.73 - $54.73Save 30% - 56%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Free CountryForce Grid Fleece Base Layer Bottoms - Women's$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Free CountryForce Grid Fleece Base Layer Top - Men'sTop Rated$29.73Save 33%compared to  $45.00Underwear Weight:LightweightSize Type:Big, RegularREI OUTLET
- Kari TraaKlara High-Waisted Base Layer Pants - Women's$62.73 - $66.73Save 25% - 30%compared to  $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxRho Boot Cut Base Layer Bottoms - Women's$72.73Save 19%compared to  $90.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaEdith Half-Zip Base Layer Top - Women's$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryForce Grid Fleece Base Layer Bottoms - Men's$29.73Save 33%compared to  $45.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's$92.73Save 28%compared to  $130.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Kari TraaSara Long-Sleeve Base Layer Top - Women's$74.73Save 25%compared to  $100.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Icebreaker260 ZoneKnit Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$119.73Save 27%compared to  $165.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxKyanite Base Layer Bottoms - Women'sTop Rated$96.73Save 19%compared to  $120.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Arc'teryxRho Base Layer Bottoms - Women's$79.73Save 20%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Hot ChillysOriginals Print Base Layer Crew - Kids'$39.73Save 27%compared to  $55.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Free CountryMicrotech Heat Cocarber Base Layer Top - Women's$39.73Save 33%compared to  $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Hot ChillysOriginals Solid Base Layer Crew - Kids'$34.73Save 26%compared to  $47.50Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women'sTop Rated$27.93 - $39.95Underwear Weight:LightweightSize Type:Regular, Plus
- Kari TraaRose Light High-Waisted Base Layer Pants - Women's$81.73Save 25%compared to  $110.00Underwear 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
- Free CountryCloud Knit Crewneck Base Layer Top - Men's$26.73Save 33%compared to  $40.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men'sTop Rated$159.73Save 20%compared to  $200.00Underwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Hot ChillysOriginals Print Base Layer Pants - Kids'$39.73Save 27%compared to  $55.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
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