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Base Layer Tops
(267 products)Products (267)
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REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$54.95Underwear Weight:MidweightSize Type:Regular, Big, TallREI Co-opMidweight Base Layer Half-Zip Top - Women's
$59.95Underwear Weight:MidweightSize Type:Regular, Plus- Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$115.00Underwear Weight:MidweightSize Type:Regular, Big - Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$125.00Underwear Weight:HeavyweightSize Type:Regular, Big REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$26.83 - $54.95Underwear Weight:MidweightSize Type:Regular, PlusSmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$90.00Underwear Weight:LightweightSize Type:Regular, BigREI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$39.83 - $79.95Underwear Weight:LightweightSize Type:Regulartasc PerformanceElevation Merino T-Shirt - Men's
$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET- Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$79.95Underwear Weight:LightweightSize Type:Regular, Big - Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$115.00Underwear Weight:MidweightSize Type:Regular, Plus - Top Rated
tasc PerformanceElevation Merino T-Shirt - Women's
$54.73Save 30%compared to  $79.00Underwear Weight:LightweightSize Type:Regular, PlusREI OUTLET - Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$89.95Underwear Weight:LightweightSize Type:Regular, Big REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$99.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall- Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$99.95Underwear Weight:HeavyweightSize Type:Regular, Plus - Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$120.00Underwear Weight:MidweightSize Type:Regular, Plus Free CountryForce Grid Fleece Base Layer Top - Men's
$29.73Save 33%compared to  $45.00Underwear Weight:LightweightSize Type:Regular, BigREI OUTLET- Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$104.95Underwear Weight:HeavyweightSize Type:Regular, Plus REI Co-opLightweight Base Layer Long-Sleeve Crew Top - Men's Tall Sizes
$27.93Save 30%compared to  $39.95Underwear Weight:LightweightSize Type:Tall- Top Rated
Arc'teryxRho Heavyweight Zip-Neck Base Layer Top - Men's
$140.00Underwear Weight:HeavyweightSize Type:Regular, Big Helly HansenLIFA Merino Midweight Half-Zip Base Layer Top - Women's
$79.73 - $82.73Save 24% - 27%compared to  $110.00Underwear Weight:MidweightSize Type:RegularREI OUTLET- Top Rated
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$59.95Underwear Weight:MidweightSize Type:Regular, Big, Tall SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$53.83 - $90.00Underwear Weight:LightweightSize Type:Regular, PlusREI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$104.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall- Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00Underwear Weight:MidweightSize Type:Regular, Big Helly HansenLIFA Merino Midweight Crew Base Layer Top - Women's
$74.73Save 25%compared to  $100.00Underwear Weight:MidweightSize Type:RegularREI OUTLETSmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$82.73Save 28%compared to  $115.00Underwear Weight:MidweightSize Type:RegularREI OUTLETKari TraaSara Long-Sleeve Base Layer Top - Women's
$100.00Underwear Weight:HeavyweightSize Type:RegularIcebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$115.00Underwear Weight:MidweightSize Type:Regular, BigBurtonMidweight Base Layer Crew Top - Women's
$64.95Underwear Weight:MidweightSize Type:Regular, Plus- Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00Underwear Weight:MidweightSize Type:Regular, Big
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