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- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women'sTop Rated$105.00Underwear Weight:MidweightSize Type:Regular, Plus
- Kari TraaFryd Base Layer Top - Women's$19.83 - $60.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaEmbla Wool Base Layer Top - Women's$60.00Underwear Weight:UltralightweightSize Type:Regular
- Kari TraaRose Capri High-Waist Base Layer Bottoms - Women's$100.00Underwear Weight:HeavyweightSize Type:Regular
- IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men'sTop Rated$105.00Underwear Weight:MidweightSize Type:Regular, Big
- Icebreaker200 Sonebula Leggings - Men's$89.73Save 25%compared to  $120.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Icebreaker260 Tech High-Rise Base Layer Leggings - Women'sTop Rated$125.00Underwear Weight:MidweightSize Type:Regular
- IcebreakerMerino 200 Oasis Thermal Base Layer Leggings - Women's$78.73Save 25%compared to  $105.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:MidweightSize Type:Regular, PlusREI OUTLET
- Kari TraaRose High-Waisted Base Layer Pants - Women'sTop Rated$110.00Underwear Weight:LightweightSize Type:Regular, Plus
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Women'sTop Rated$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:PlusREI OUTLET
- Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$115.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaFryd Base Layer Pants - Women's$60.00Underwear Weight:MidweightSize Type:Regular
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$135.00Underwear Weight:MidweightSize Type:Regular, Big
- Helly HansenGraphic Lifa Merino Base Layer Set - Kids'$74.73Save 32%compared to  $110.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's$80.00Underwear Weight:UltralightweightSize Type:Regular
- Icebreaker260 ZoneKnit Base Layer Leggings - Men'sTop Rated$119.73Save 27%compared to  $165.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:BigREI OUTLET
- Kari TraaLune Long-Sleeve Base Layer Top - Women's$41.73Save 35%compared to  $65.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Kari TraaMina Long-Sleeve Base Layer Top - Women's$44.73Save 25%compared to  $60.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's$125.00Underwear Weight:LightweightSize Type:Regular, Big
- Kari TraaRose Half-Zip Base Layer Top - Women's$120.00 - $130.00Underwear Weight:MidweightSize Type:Regular, Plus
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Men'sTop Rated$99.73Save 26%compared to  $135.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings With Fly - Men'sTop Rated$93.73Save 25%compared to  $125.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- Kari TraaRose Base Layer Hoodie - Women's$97.73Save 24%compared to  $130.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:RegularREI OUTLET
- Kari TraaFryd Base Layer Pants - Women's$37.73 - $44.73Save 25% - 31%compared to  $55.00 - $60.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker125 ZoneKnit Base Layer Leggings - Men's$125.00Underwear Weight:UltralightweightSize Type:Regular, Big
- Icebreaker200 Oasis 3/4 Base Layer Bottoms - Men's$95.00Underwear Weight:MidweightSize Type:Regular
- Kari TraaAlma Hood Base Layer Top - Women's$59.73Save 25%compared to  $80.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:UltralightweightSize Type:RegularREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$135.00Underwear Weight:MidweightSize Type:Regular
- Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$115.00Underwear Weight:LightweightSize Type:Regular
- Kari TraaLilja Long-Sleeve Base Layer Top - Women's$49.73Save 24%compared to  $66.00Members use code OUT4JUL25 for $20 off $100+ at REI OutletUnderwear Weight:HeavyweightSize Type:RegularREI OUTLET
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