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Long Sleeve Base Layers
(251 products)Products (251)
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SmartwoolClassic All-Season Merino Base Layer Long-Sleeve Shirt - Women's
$66.73Save 25%compared to  $90.00Underwear Weight:MidweightSize Type:RegularREI OUTLETHelly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's
$86.73 - $89.73Save 25% - 27%compared to  $120.00Underwear Weight:MidweightSize Type:RegularREI OUTLETArms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Women's
$85.00 - $100.00Underwear Weight:UltralightweightSize Type:Regular- Top Rated
tasc PerformanceElevation Merino T-Shirt - Women's
$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$96.73Save 25%compared to  $130.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLETSmartwoolClassic Thermal Merino Base Layer Hoodie - Men's
$104.73Save 27%compared to  $145.00Underwear Weight:MidweightSize Type:RegularREI OUTLETKari TraaJuliane Wool Long-Sleeve Base Layer Top - Women's
$90.73Save 30%compared to  $130.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET- Top Rated
Sweaty BettyHigh-Neck Jacquard Base Layer Top - Women's
$82.73Save 29%compared to  $118.00Underwear Weight:MidweightSize Type:RegularREI OUTLET SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Men's
$90.73Save 30%compared to  $130.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLETHelly HansenLifa Merino Midweight Graphic Base Layer Top - Women's
$79.73 - $82.73Save 24% - 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLETFree CountryForce Grid Fleece Base Layer Top - Women's
$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLETKari TraaRose Light Half-Zip Base Layer Top - Women's
$90.73Save 30%compared to  $130.00Underwear Weight:MidweightSize Type:RegularREI OUTLETIcebreakerMerino 260 Vertex Long-Sleeve Half-Zip Herenga Base Layer Top - Women's
$99.73Save 33%compared to  $150.00Size Type:RegularREI OUTLETArtilectDarkhorse 185 Zoned Crew Base Layer Top - Men's
$109.73Save 31%compared to  $160.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLETHelly HansenLIFA Merino Midweight Graphic Base Layer Crew Top - Women's
$110.00Underwear Weight:MidweightSize Type:RegularKari TraaFryd Long-Sleeve Base Layer Top - Women's
$41.73Save 30%compared to  $60.00Underwear Weight:LightweightSize Type:RegularREI OUTLETHelly HansenVerglas Half-Zip Top - Women's
$63.73Save 25%compared to  $85.00Underwear Weight:LightweightSize Type:RegularREI OUTLETSmartwoolIntraknit Active Base Layer Crew Shirt - Men's
$81.73Save 25%compared to  $110.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLETArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's
$116.73Save 31%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLETFree CountryMicrotech Heat Cocaber Base Layer Top - Women's
$34.73Save 30%compared to  $50.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLETIcebreaker200 Oasis Sonebula Long-Sleeve Crewe Base Layer Top - Women's
$89.73Save 25%compared to  $120.00Underwear Weight:LightweightSize 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 OUTLETArtilectGoldhill 125 Zoned Crew Base Layer Top - Men's
$89.73Save 30%compared to  $130.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLETIcebreakerMerino 200 Sonebula Long-Sleeve High-Neck Base Layer Top - Women's
$93.73Save 25%compared to  $125.00Underwear Weight:MidweightSize Type:RegularREI OUTLETArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Men's
$116.73Save 31%compared to  $170.00Underwear Weight:MidweightSize Type:RegularREI OUTLETIcebreakerMerino 200 Sonebula Long-Sleeve Crewe Base Layer Top - Men's
$89.73Save 25%compared to  $120.00Underwear Weight:MidweightSize Type:Regular, BigREI OUTLETArtilectBoulder 125 Crew Long-Sleeve Base Layer Top - Women's
$82.73Save 31%compared to  $120.00Underwear Weight:LightweightSize Type:RegularREI OUTLETKari TraaVoss Cashmere Mix Half-Zip Base Layer Top - Women's
$134.73Save 25%compared to  $180.00Underwear Weight:MidweightSize Type:RegularREI OUTLETIcebreaker125 ZoneKnit Merino Long-Sleeve Crewe Thermal Top - Men's
$86.73 - $93.73Save 25% - 30%compared to  $125.00Underwear Weight:UltralightweightSize Type:Regular, BigREI OUTLETIcebreakerMerino 260 Vertex Long-Sleeve Crewe Natural Shades Base Layer Top - Women's
$104.73Save 25%compared to  $140.00Underwear Weight:HeavyweightSize Type:RegularREI OUTLET
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