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How to Choose Base Layers
Choosing the right underwear (base layer) is essential—learn how moisture-wicking materials, fabric weight and fit affect comfort in the outdoors.
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Smartwool Base Layer Tops: Deals
(29 products)Products (29)
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SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$62.93 - $90.00 - ColorsREI Outlet
SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's
$93.73Save 25%compared to $125.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$85.73Save 25%compared to $115.00 - ColorsREI Outlet
SmartwoolClassic All Season Merino Long-Sleeve Base Layer Top - Men's
$66.73Save 25%compared to $90.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$82.73Save 24%compared to $110.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$85.73Save 25%compared to $115.00 - ColorsREI Outlet
SmartwoolMerino Lace Hoodie - Women's
$70.73Save 25%compared to $95.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$81.73Save 25%compared to $110.00 - ColorsREI Outlet
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$93.73Save 25%compared to $125.00 - REI Outlet
SmartwoolIntraknit Thermal Merino Quarter-Zip Base Layer Top - Women's
$100.73Save 25%compared to $135.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Pattern Crew Base Layer Top - Women's
$81.73Save 25%compared to $110.00 - REI Outlet
SmartwoolClassic All Season Merino Quarter-Zip Base Layer Top - Men's
$70.73Save 25%compared to $95.00 - REI Outlet
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$93.73Save 25%compared to $125.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Pattern Crew Base Layer Top - Men's
$81.73Save 25%compared to $110.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$44.73Save 25%compared to $60.00 - ColorsREI Outlet
SmartwoolIntraknit Thermal Max Merino Pattern Base Layer Hoodie - Women's
$119.73Save 25%compared to $160.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Plant-Based Dye Logo Crew Base Layer Top - Men's
$81.73Save 25%compared to $110.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Base Layer Logo Hoodie - Men's
$104.73Save 25%compared to $140.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Patterned Quarter-Zip Base Layer Top - Men's
$85.73Save 25%compared to $115.00 - REI Outlet
SmartwoolClassic Thermal Merino Base Layer Hoodie - Kids'
$51.73Save 26%compared to $70.00 - ColorsREI Outlet
SmartwoolClassic Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's
$89.73Save 25%compared to $120.00 - REI Outlet
SmartwoolMerino Base Layer T-Shirt - Women's
$55.73Save 25%compared to $75.00 - REI Outlet
SmartwoolClassic Thermal Merino Base Layer Logo Hoodie - Women's
$111.73Save 25%compared to $150.00 - REI Outlet
SmartwoolIntraknit Thermal Merino Patterned Half-Zip Base Layer Hoodie - Men's
$116.73Save 24%compared to $155.00 - REI Outlet
SmartwoolClassic Thermal Merino Base Layer Half-Zip Hoodie - Women's
$104.73Save 25%compared to $140.00 - REI Outlet
SmartwoolMerino 150 Hoodie - Men's
$74.73Save 25%compared to $100.00 - REI Outlet
SmartwoolClassic Thermal Merino Base Layer Logo Hoodie - Women's
$108.73Save 25%compared to $145.00 - REI Outlet
SmartwoolClassic Thermal Merino Pattern Crew Base Layer Top - Kids'
$44.73Save 25%compared to $60.00 - REI Outlet
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's Plus Sizes
$82.73Save 28%compared to $115.00
Sort: Best Match