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- SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men'sTop Rated$69.83 - $104.99Save 25% - 50%compared to  $140.00Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's$49.83 - $73.39Save 30% - 52%compared to  $104.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- tasc PerformanceElevation Merino Base Layer Bottoms - Men's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- tasc PerformanceElevation Merino Base Layer Bottoms - Women's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$79.93 - $86.19Save 25% - 30%compared to  $115.00Underwear Weight:MidweightSize Type:Regular, Plus
- Sale Ends May 26IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men'sTop Rated$78.69Save 25%compared to  $105.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends May 26SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's$86.19Save 25%compared to  $115.00Underwear Weight:MidweightSize Type:Regular
- Sale Ends May 26REI Co-opMidweight Long-Sleeve Base Layer Top - Women's$38.39Save 30%compared to  $54.95Underwear Weight:MidweightSize Type:Regular, Plus
- Sale Ends May 26REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's$55.89Save 30%compared to  $79.95Underwear Weight:LightweightSize Type:Regular
- Sale Ends May 26Kari TraaMina Long-Sleeve Base Layer Top - Women's$41.73Save 30%compared to  $60.00Underwear Weight:LightweightSize 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
- tasc PerformanceElevation Merino T-Shirt - Women'sTop Rated$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Sale Ends May 26Kari TraaLilja Long-Sleeve Base Layer Top - Women's$45.73Save 30%compared to  $66.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- tasc PerformanceElevation Merino T-Shirt - Men's$49.73Save 37%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's$81.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:Plus, RegularREI OUTLET
- Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's$86.73 - $89.73Save 25% - 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opMidweight Base Layer Half-Zip Top - Women's$29.83 - $41.89Save 30% - 50%compared to  $59.95Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Half-Zip Top - Men'sTop Rated$29.83 - $41.89Save 30% - 50%compared to  $59.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- Terramar3.0 Thermawool Crew Base Layer Top - Women's$49.73 - $52.73Save 24% - 28%compared to  $70.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends May 26SmartwoolClassic All-Season Merino T-Shirt - Men's$59.99Save 25%compared to  $80.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women'sTop Rated$49.83 - $73.39Save 26% - 50%compared to  $99.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- Terramar2.0 Cloud Nine Midweight Base Layer Capri Pants - Women's$28.73Save 28%compared to  $40.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Icebreaker200 Sonebula Leggings - Men's$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, BigREI 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
- Arc'teryxRho Heavyweight Base Layer Bottoms - Men'sTop Rated$84.83Save 29%compared to  $120.00Underwear Weight:HeavyweightSize Type:Regular, Big
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$44.83 - $62.89Save 30% - 50%compared to  $89.95Underwear Weight:LightweightSize Type:Regular
- Sale Ends May 26SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$67.49Save 25%compared to  $90.00Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's$62.93 - $67.49Save 25% - 30%compared to  $90.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's$49.83 - $99.95Underwear Weight:HeavyweightSize Type:Regular, Big
- Sale Ends May 26REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women'sTop Rated$27.89Save 30%compared to  $39.95Underwear Weight:LightweightSize Type:Regular, Plus
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