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- HalfdaysJohnson Base Layer Top - Women's$95.00Underwear Weight:UltralightweightSize Type:Regular
- Arc'teryxRho Zip-Neck Base Layer Top - Women'sTop Rated$120.00Underwear Weight:LightweightSize Type:Regular, Plus
- HalfdaysSophia Base Layer Leggings - Women's$95.00Underwear Weight:LightweightSize Type:Regular, Plus
- SENIQWool Sculpt Merino Mock-Neck Long-Sleeve Base Layer Shirt - Women's$128.00Underwear Weight:HeavyweightSize Type:Regular
- REI Co-opLightweight Crew Base Layer Top - Women'sTop Rated$34.95Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opLightweight Crew Base Layer Top - Men'sTop Rated$14.83 - $34.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- SmartwoolIntraknit Thermal Merino Base Layer Colorblock Crew - Men's$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Icebreaker200 Sonebula Leggings - Men'sTop Rated$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- IcebreakerMerino 200 Oasis Thermal Leggings - Women'sTop Rated$69.93 - $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- ColumbiaMidweight Stretch Long-Sleeve Base Layer Top - Women'sTop Rated$39.93Save 27%compared to  $55.00Underwear Weight:MidweightSize Type:Regular
- REI Co-opMerino Midweight Base Layer Bottoms - Kids'Top Rated$49.95Underwear Weight:MidweightSize Type:Regular
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$89.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opMerino Midweight Base Layer Crew Top - Kids'Top Rated$49.95Underwear Weight:MidweightSize Type:Regular
- Kari TraaSmekker Half-Zip Base Layer Top - Women's$97.93 - $140.00Underwear Weight:LightweightSize Type:Regular
- REI Co-opMerino 185 Base Layer Top - Men's$69.95Underwear Weight:LightweightSize Type:Regular, Big
- IcebreakerMerino 200 Oasis High-Rise Base Layer Leggings - Women's$130.00Underwear Weight:MidweightSize Type:Regular
- IcebreakerMerino 200 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$119.73Save 25%compared to  $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's$99.00Underwear Weight:MidweightSize Type:Regular, Big
- SmartwoolThermal Merino Rib Turtleneck Base Layer Top - Women's$130.00Underwear Weight:MidweightSize Type:Regular
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Crew One-Piece - Men's$250.00Underwear Weight:MidweightSize Type:Big
- Kari TraaLucie Base Layer Pants - Women's$58.73Save 26%compared to  $80.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$79.93 - $130.00Underwear Weight:LightweightSize Type:Regular, Plus
- Kari TraaFryd Base Layer Pants - Women's$40.73Save 25% - 32%compared to  $55.00 - $60.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- HalfdaysFay Midweight Merino Base Layer Top - Women's$130.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Active Base Layer Bottoms - Men's$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:BigREI OUTLET
- SpraywayEffra Leggings Base Layer Bottoms - Women's$36.73Save 26%compared to  $49.95Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Arc'teryxRho SV Base Layer Bottoms - Men's$120.00Underwear Weight:HeavyweightSize Type:Regular, Big
- REI Co-opLightweight Half-Zip Base Layer Top - Men'sTop Rated$49.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
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