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- tasc PerformanceElevation Merino T-Shirt - Women's$46.73Save 40%compared to $79.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- REI Co-opHeavyweight Merino Base Layer Bottoms - Women's$29.83 - $74.89Save 25% - 70%compared to $99.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- SmartwoolClassic All Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$66.73Save 25%compared to $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Hoodie - Men's$108.73Save 25%compared to $145.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men'sTop Rated$89.73Save 25%compared to $120.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Sale Ends May 25SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's$112.49Save 25%compared to $150.00Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's$59.83 - $112.49Save 25% - 60%compared to $150.00Underwear Weight:MidweightSize Type:Regular, Big
- Arc'teryxSatoro Merino Wool Crew Neck Long-Sleeve Base Layer Top - Women'sTop Rated$95.73Save 20%compared to $120.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET
- Sale Ends May 25Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$86.19 - $97.49Save 25%compared to $115.00 - $130.00Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Bottoms - Toddlers'Top Rated$17.93Save 28%compared to $24.95Underwear Weight:MidweightSize Type:Regular
- Arc'teryxKyanite Base Layer Crew Top - Women's$95.73Save 20%compared to $120.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Sale Ends May 25Icebreaker260 Tech High-Rise Base Layer Leggings - Women'sTop Rated$93.69Save 25%compared to $125.00Underwear Weight:MidweightSize Type:Regular
- Sale Ends May 25REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$67.39Save 25%compared to $89.95Underwear Weight:LightweightSize Type:Regular
- Sale Ends May 25Kari TraaEdith Half-Zip Base Layer Top - Women'sTop Rated$76.73Save 30%compared to $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opMidweight Base Layer Crew Top - Toddlers'Top Rated$17.93Save 28%compared to $24.95Underwear Weight:MidweightSize Type:Regular
- Sale Ends May 25SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men'sTop Rated$86.19Save 25%compared to $115.00Underwear Weight:MidweightSize Type:Regular, Big
- tasc PerformanceElevation Merino Base Layer Bottoms - Women's$46.73Save 40%compared to $79.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's$63.73Save 35%compared to $99.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends May 25IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men'sTop Rated$89.99Save 25%compared to $120.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaKlara High-Waisted Base Layer Pants - Women's$62.73Save 30%compared to $90.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- Sale Ends May 25REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men'sTop Rated$74.89Save 25%compared to $99.95Underwear Weight:HeavyweightSize Type:Regular, Big
- IcebreakerMerino 200 Oasis Thermal Leggings - Women'sTop Rated$51.83 - $89.99Save 25% - 50%compared to $105.00 - $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Half-Zip Base Layer Hoodie - Women's$108.73Save 25%compared to $145.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxRho Base Layer Bottoms - Women's$73.73Save 26%compared to $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- Arc'teryxSatoro Merino Wool Base Layer Bottoms - Women's$95.73Save 20%compared to $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's$49.83 - $104.99Save 25% - 64%compared to $140.00Underwear Weight:MidweightSize Type:Regular
- Arc'teryxRho LT Zip-Neck Base Layer Top - Men'sTop Rated$120.00Underwear Weight:LightweightSize Type:Regular, Big
- Arc'teryxRho Insulated 3/4 Base Layer Bottoms - Men'sTop Rated$159.73Save 20%compared to $200.00Underwear Weight:HeavyweightSize Type:BigREI OUTLET
- Sale Ends May 25REI Co-opMerino 185 Base Layer Top - Men's$52.39Save 25%compared to $69.95Underwear Weight:LightweightSize Type:Regular
- PatagoniaCapilene Midweight Crew Base Layer Top - Men'sTop Rated$70.93Save 20%compared to $89.00Underwear Weight:MidweightSize Type:Regular, Big
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