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- PatagoniaCapilene Thermal Weight Long Underwear Bottoms - Women's$99.00Underwear Weight:HeavyweightSize Type:Regular
- Ortovox120 Comp Light Base Layer Hoody - Men's$120.00Underwear Weight:LightweightSize Type:Regular, Big
- CraftCORE Dry Active Comfort Base Layer Top - Men's$39.73Save 38%compared to  $64.95Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Arc'teryxRho Boot Cut Base Layer Bottoms - Women's$72.73Save 19%compared to  $90.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- BurtonFleece Base Layer Set - Kids'$69.95Underwear Weight:MidweightSize Type:Regular
- Outdoor ResearchAlpine Onset Merino 150 Base Layer Hoodie - Men'sTop Rated$119.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes$79.95Underwear Weight:LightweightSize Type:Plus
- Free CountryMicrotech Heat Cocarber Base Layer Bottoms - Women's$39.73Save 33%compared to  $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$78.73Save 25%compared to  $105.00Underwear Weight:LightweightSize Type:Big, RegularREI OUTLET
- Hot ChillysOriginals Solid Base Layer Crew - Kids'$34.73Save 26%compared to  $47.50Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Kari TraaSara Half-Zip Base Layer Top - Women'sNew arrival$79.73Save 27%compared to  $110.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Kari TraaElse Base Layer Pants - Women's$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes$79.95Underwear Weight:LightweightSize Type:Tall, Big
- IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men'sTop Rated$105.00Underwear Weight:MidweightSize Type:Regular, Big
- Arc'teryxRho Hybrid Insulated Base Layer Bottoms - Women's$145.73Save 19%compared to  $180.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's$47.73Save 36%compared to  $75.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- SmartwoolIntraknit Thermal Max Merino Base Layer Pattern Hoodie - Women's$114.73Save 30%compared to  $165.00Size 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
- The North FaceSummit Series Pro 120 Crew Base Layer Top - Men'sTop Rated$90.00Underwear Weight:UltralightweightSize Type:Regular, Big
- Arc'teryxKyanite Base Layer Bottoms - Women'sTop Rated$120.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Pants - Women's$69.73Save 30%compared to  $100.00Underwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
- SmartwoolClassic Thermal Merino Lettuce Edge Base Layer Bottoms - Women's$82.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Hot ChillysClima-Wool Base Layer Bottoms - Men's$79.73Save 33%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes$79.95Underwear Weight:LightweightSize Type:Plus
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes$89.95Underwear Weight:LightweightSize Type:Plus
- REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes$69.95Underwear Weight:LightweightSize Type:Plus
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes$115.00 - $120.00Underwear Weight:MidweightSize Type:Plus
- SmartwoolThermal Merino Rib Turtleneck Base Layer Top - Women's$130.00Underwear Weight:MidweightSize Type:Regular
- BurtonMidweight Base Layer Pants - Women's$19.83Save 69%compared to  $64.95Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's$130.00Underwear Weight:LightweightSize Type:Regular
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