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Base Layer Tops
(229 products)Products (229)
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- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men'sTop Rated$39.83 - $79.95Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Base Layer Half-Zip Top - Women's$19.83 - $59.95Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opMidweight Base Layer Half-Zip Top - Men'sTop Rated$29.83 - $59.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women'sTop Rated$39.95Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMidweight Long-Sleeve Base Layer Top - Women's$37.93 - $54.95Underwear Weight:MidweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's$62.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men'sTop Rated$66.93 - $90.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men'sTop Rated$39.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- SmartwoolClassic All-Season Merino T-Shirt - Women's$59.93 - $80.00Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic All-Season Merino T-Shirt - Men's$59.93 - $80.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMerino 185 Base Layer Top - Women's$48.93 - $69.95Underwear Weight:LightweightSize Type:Regular
- Arc'teryxRho LT Zip-Neck Base Layer Top - Men'sTop Rated$120.00Underwear Weight:LightweightSize Type:Regular, Big
- REI Co-opMidweight Long-Sleeve Base Layer Top - Men'sTop Rated$37.93 - $54.95Underwear Weight:MidweightSize Type:Regular, Big, Tall
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men'sTop Rated$49.83 - $89.95Underwear Weight:LightweightSize Type:Regular, Big
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Women'sTop Rated$115.00Underwear Weight:MidweightSize Type:Regular, Plus
- IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women'sTop Rated$99.73Save 26%compared to  $135.00Underwear Weight:HeavyweightSize Type:Regular, PlusREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's$79.95Underwear Weight:LightweightSize Type:Regular
- REI Co-opLightweight Crew Base Layer Top - Women'sTop Rated$29.95Underwear Weight:LightweightSize Type:Regular, Plus
- REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women'sTop Rated$62.93 - $89.95Underwear Weight:LightweightSize Type:Regular
- SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's$70.93 - $95.00Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opMidweight Base Layer Crew Top - Kids'Top Rated$23.93 - $34.95Underwear Weight:MidweightSize Type:Regular
- SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women'sTop Rated$39.83 - $120.00Underwear Weight:MidweightSize Type:Regular, Plus
- REI Co-opLightweight Crew Base Layer Top - Men'sTop Rated$29.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
- REI Co-opLightweight Half-Zip Base Layer Top - Women's$44.95Underwear Weight:LightweightSize Type:Regular, Plus
- SmartwoolClassic Thermal Merino Crew Base Layer Top - Men'sTop Rated$69.83 - $115.00Underwear Weight:MidweightSize Type:Regular, Big
- REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's$99.95Underwear Weight:HeavyweightSize Type:Regular, Big, Tall
- SmartwoolIntraknit Active Long-Sleeve Base Layer Top - Women's$59.83Save 45%compared to  $110.00Underwear Weight:MidweightSize Type:Regular
- Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's$34.73Save 30%compared to  $50.00Underwear Weight:MidweightSize Type:RegularREI OUTLET
- REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes$39.83 - $79.95Underwear Weight:LightweightSize Type:Plus
- REI Co-opLightweight Half-Zip Base Layer Top - Men's$44.95Underwear Weight:LightweightSize Type:Regular, Big, Tall
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