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- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men'sTop Rated$27.93 - $39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- REI Co-opHeavyweight Merino Base Layer Bottoms - Women'sTop Rated$99.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- REI Co-opHeavyweight Merino Base Layer Bottoms - Men'sTop Rated$99.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women'sTop Rated$89.99 - $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's$99.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- Sale Ends Dec 1SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men'sTop Rated$89.99Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends Dec 8REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men'sTop Rated$55.89Save 30%compared to  $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women'sTop Rated$99.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- REI Co-opLightweight Base Layer Bottoms - Men'sTop Rated$39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- Sale Ends Dec 8REI Co-opMerino 185 Base Layer Bottoms - Men's$55.89Save 30%compared to  $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women'sTop Rated$27.93 - $39.95Underwear Weight:LightweightSize Type:Regular, Plus
- Sale Ends Dec 8IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women'sTop Rated$78.69Save 25%compared to  $105.00Underwear Weight:MidweightSize Type:Regular, Plus
- Sale Ends Dec 8REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's$55.89Save 30%compared to  $79.95Underwear Weight:LightweightSize Type:Regular
- Sale Ends Dec 8IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men'sTop Rated$78.69Save 25%compared to  $105.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends Dec 8REI Co-opMerino 185 Base Layer Bottoms - Women's$55.89Save 30%compared to  $79.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women'sTop Rated$104.95Underwear Weight:HeavyweightSize Type:Regular, Plus
- REI Co-opLightweight Half-Zip Base Layer Top - Men'sTop Rated$44.95Underwear Weight:LightweightSize Type:Regular, Big
- Sale Ends Dec 8Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women'sTop Rated$93.69Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:Regular, Plus
- REI Co-opLightweight Crew Base Layer Top - Men'sTop Rated$19.93 - $29.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's$104.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- Sale Ends Dec 8IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men'sTop Rated$78.69Save 25%compared to  $105.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends Dec 8REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$62.89Save 30%compared to  $89.95Underwear Weight:LightweightSize Type:Regular, Big
- Kari TraaSara Half-Zip Base Layer Top - Women's$79.73Save 27%compared to  $110.00Members use code CYBER2025 to save an extra 25% on this item, thru 12/1Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
- REI Co-opLightweight Base Layer Tights - Women'sTop Rated$39.95Underwear Weight:LightweightSize Type:Regular, Plus
- Sale Ends Dec 8IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men'sTop Rated$93.69Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:Regular, Big
- Sale Ends Dec 1SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men'sTop Rated$71.19Save 25%compared to  $95.00Underwear Weight:MidweightSize Type:Regular, Big
- Sale Ends Dec 8Icebreaker260 Merino Tech Thermal Leggings with Fly - Men'sTop Rated$93.69Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:Regular, Big
- Sale Ends Dec 8REI Co-opMerino 185 Base Layer Top - Men's$48.89Save 30%compared to  $69.95Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolIntraknit Active Base Layer Crew Shirt - Women's$79.73Save 27%compared to  $110.00Members use code CYBER2025 to save an extra 25% on this item, thru 12/1Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opLightweight Half-Zip Base Layer Top - Women'sTop Rated$44.95Underwear Weight:LightweightSize Type:Regular, Plus
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