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- IcebreakerMerino 200 Oasis Long-Sleeve Base Layer Crew Top - Kids'Top Rated$41.93Save 30%compared to  $60.00Underwear Weight:MidweightSize Type:Regular
- SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's$130.00Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes$115.00 - $120.00Underwear Weight:MidweightSize Type:Plus
- Terramar3.0 Thermawool Base Layer Tights - Women's$52.73Save 24%compared to  $70.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Base Layer Crew One-Piece - Men'sNew arrival$250.00Underwear Weight:MidweightSize Type:Regular, Big
- Kari TraaLucie Base Layer Pants - Women's$58.73Save 26%compared to  $80.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker260 ZoneKnit Base Layer Leggings - Men'sTop Rated$119.73Save 27%compared to  $165.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:HeavyweightSize Type:BigREI OUTLET
- Icebreaker125 ZoneKnit Merino Thermal Leggings - Men's$93.73Save 25%compared to  $125.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:UltralightweightSize Type:Regular, BigREI OUTLET
- StanceAlonzo Boxer Briefs - Men's$19.73Save 26%compared to  $27.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:RegularREI OUTLET
- Sale Ends Aug 28ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Men'sTop Rated$79.99Save 50%compared to  $160.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Sale Ends Aug 28StancePalmer Boxer Briefs - Men's$12.49Save 50%compared to  $25.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:Regular, BigREI OUTLET
- Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's$79.73Save 27%compared to  $110.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Men's$130.00Size Type:Regular, Big
- IcebreakerMerino 260 Tech Thermal Base Layer Leggings With Fly - Men'sTop Rated$93.73Save 25%compared to  $125.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Kids'$52.73Save 29%compared to  $75.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Women's$85.00 - $100.00Underwear Weight:UltralightweightSize Type:Regular
- Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Women's$86.73Save 27%compared to  $120.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's$92.73Save 28%compared to  $130.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:Regular, BigREI OUTLET
- Helly HansenLifa Merino Midweight Base Layer Pants - Men's$100.00 - $105.00Underwear Weight:MidweightSize Type:Big
- SaxxDropTemp Cooling Mesh Boxer Briefs - Men's$38.00Size Type:Regular
- IcebreakerMerino 200 Oasis Base Layer Leggings - Kids'$41.93Save 30%compared to  $60.00Underwear Weight:LightweightSize Type:Regular
- RONHILLBrief Underwear - Women's$19.73Save 34%compared to  $29.95Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:RegularREI OUTLET
- IcebreakerMerino 200 Oasis Long-Sleeve Crewe Macro Forms Base Layer Top - Women's$85.73Save 25%compared to  $115.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:MidweightSize Type:RegularREI OUTLET
- StanceInvestor Boxer Briefs - Men's$20.73Save 30%compared to  $30.00Members use code LABORDAY2025 for an extra 20% off at REI OutletSize Type:RegularREI OUTLET
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'Top Rated$35.93 - $65.00Underwear Weight:MidweightSize Type:Regular
- Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Women's$84.73Save 26%compared to  $115.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- Ortovox230 Competition Long-Sleeve Base Layer Top - Men's$110.00Underwear Weight:MidweightSize Type:Regular, Big
- Helly HansenHH LIFA ACTIVE Base Layer Set - Kids'$54.73Save 31%compared to  $80.00Members use code LABORDAY2025 for an extra 20% off at REI OutletUnderwear Weight:LightweightSize Type:RegularREI OUTLET
- Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$115.00Underwear Weight:MidweightSize Type:Regular, Big
- Outdoor ResearchAlpine Onset Merino 150 Base Layer Hoodie - Women'sTop Rated$119.00Underwear Weight:LightweightSize Type:Regular, Plus
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