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Icebreaker200 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Men's
$109.73Save 26%compared to  $150.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET - Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
$86.73Save 24%compared to  $115.00Underwear Weight:MidweightSize Type:Regular, PlusREI OUTLET SmartwoolIntraknit Active Base Layer Crew Shirt - Men's
$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:Big, RegularREI OUTLETHelly HansenGraphic Lifa Merino Base Layer Set - Kids'
$74.73Save 32%compared to  $110.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLETKari TraaAlma Base Layer Pants - Women's
$52.73Save 24%compared to  $70.00Underwear Weight:UltralightweightSize Type:RegularREI OUTLETFree CountryMicrotech Heat Cocaber Base Layer Bottoms - Women's
$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize Type:RegularREI OUTLET- Top Rated
Helly HansenLifa Merino Midweight Graphic Base Layer Top - Women's
$79.73 - $82.73Save 24% - 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET - Top Rated
IcebreakerMerino 260 Tech Thermal Base Layer Leggings With Fly - Men's
$93.73Save 25%compared to  $125.00Underwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET IcebreakerMerino 200 Oasis Long-Sleeve Crewe Macro Forms Base Layer Top - Women's
$85.73Save 25%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLETArtilectFlatiron 185 Crew Base Layer Top - Men's
$96.73 - $109.73Save 30% - 31%compared to  $140.00 - $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET- Top Rated
Sweaty BettyHigh-Neck Jacquard Base Layer Top - Women's
$82.73Save 29%compared to  $118.00Underwear Weight:MidweightSize Type:RegularREI OUTLET Terramar1.0 All-Season Lightweight Merino Wool T-Shirt - Women's
$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize Type:RegularREI OUTLETCraftCORE Dry Active Comfort Base Layer Top - Men's
$39.73Save 38%compared to  $64.95Underwear Weight:MidweightSize Type:Regular, BigREI OUTLET- Top Rated
IcebreakerMerino 200 Sonebula Long-Sleeve High-Neck Base Layer Top - Women's
$93.73Save 25%compared to  $125.00Underwear Weight:MidweightSize Type:RegularREI OUTLET IcebreakerMerino Base Layer Leggings - Women's
$149.73Save 25%compared to  $200.00Size Type:RegularREI OUTLETHelly HansenLIFA Merino Midweight 2-In-1 Base Layer Hoodie - Women's
$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLET- Top Rated
Icebreaker260 ZoneKnit Base Layer Leggings - Men's
$119.73Save 27%compared to  $165.00Underwear Weight:HeavyweightSize Type:Regular, BigREI OUTLET IcebreakerMerino 260 Vertex Long-Sleeve Half-Zip Herenga Base Layer Top - Women's
$99.73Save 33%compared to  $150.00Size Type:RegularREI OUTLETKari TraaFryd Base Layer Pants - Women's
$32.73 - $44.73Save 25% - 40%compared to  $55.00 - $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLETArtilectFlatiron 185 Base Layer Leggings - Men's
$109.73Save 31%compared to  $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLETHelly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's
$82.73Save 24%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLETSmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Men's
$90.73Save 30%compared to  $130.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLETIcebreakerMerino 200 Sonebula Long-Sleeve High-Neck Base Layer Top - Men's
$93.73Save 25%compared to  $125.00Underwear Weight:MidweightSize Type:RegularREI OUTLETKari TraaMalia Long-Sleeve Base Layer Top - Women's
$52.73Save 24%compared to  $70.00Underwear Weight:MidweightSize Type:Regular, PlusREI OUTLETHelly HansenLIFA Merino Midweight 2-In-1 Base Layer Pants - Women's
$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLETFree CountryForce Grid Fleece Base Layer Top - Women's
$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLETFree CountryForce Grid Fleece Base Layer Bottoms - Women's
$34.73Save 36%compared to  $55.00Underwear Weight:LightweightSize Type:RegularREI OUTLETTerramar2.0 Ultra Merino Turtleneck Base Layer Top - Women's
$52.73Save 29%compared to  $75.00Underwear Weight:MidweightSize Type:RegularREI OUTLETTerramar2.0 Cloud Nine Midweight Performance Thermal Turtleneck - Women's
$35.73Save 25%compared to  $48.00Underwear Weight:MidweightSize Type:RegularREI OUTLETTerramar2.0 Cloud Nine Midweight Performance Base Layer Scoop Shirt - Women's
$33.73Save 25%compared to  $45.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
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