Outdoor Base Layer Shirts & Tops
53 items found
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Low Stock
![White Arc'teryx Ionia Merino Wool Long Sleeve](https://m.media-amazon.com/images/I/71xS27IP-nL._AC_SR768,1024_.jpg)
![White Arc'teryx Ionia Merino Wool Long Sleeve](https://m.media-amazon.com/images/I/81s-xT6+nKL._AC_SR768,1024_.jpg)
![Black Hot Chillys Kids Peachskins Crew Neck (Little Kids/Big Kids)](https://m.media-amazon.com/images/I/81+mMg7lMUL._AC_SR768,1024_.jpg)
![Black Smartwool Classic All-Season Merino Base Layer Long Sleeve](https://m.media-amazon.com/images/I/61YMZkGcDiL._AC_SR768,1024_.jpg)
![Black Under Armour UA Tac Tech Tee](https://m.media-amazon.com/images/I/61qQXuQlTnL._AC_SR768,1024_.jpg)
![Black Under Armour UA Tac Tech Tee](https://m.media-amazon.com/images/I/81kQ9Sa5ClL._AC_SR768,1024_.jpg)
![Black Under Armour UA Tac Heat Gear Compression Tee](https://m.media-amazon.com/images/I/61QQXOPDVbL._AC_SR768,1024_.jpg)
![Black Under Armour UA Tac Heat Gear Compression Tee](https://m.media-amazon.com/images/I/71tExUHrxyL._AC_SR768,1024_.jpg)
Low Stock
![Black Hot Chillys Kids Originals Crew Neck (Little Kids/Big Kids)](https://m.media-amazon.com/images/I/81AUvfXF5GL._AC_SR768,1024_.jpg)
Low Stock
![Blue Arc'teryx Kyanite Baselayer Zip Neck](https://m.media-amazon.com/images/I/710XkJCnBpL._AC_SR768,1024_.jpg)
![Blue Arc'teryx Kyanite Baselayer Zip Neck](https://m.media-amazon.com/images/I/71Vz1K137mL._AC_SR768,1024_.jpg)
![Black Hot Chillys Peachskins Roll T-Neck](https://m.media-amazon.com/images/I/81w-iR+g3BL._AC_SR768,1024_.jpg)
![Black Hot Chillys Peachskins Roll T-Neck](https://m.media-amazon.com/images/I/71xtd5Bp+FL._AC_SR768,1024_.jpg)
![Black Hot Chillys Pepper Skins Crew Neck](https://m.media-amazon.com/images/I/71cAkPqye1L._AC_SR768,1024_.jpg)
![Black Hot Chillys Pepper Skins Crew Neck](https://m.media-amazon.com/images/I/71EjPS51poL._AC_SR768,1024_.jpg)
![Green Arc'teryx Taema Thermal Crew Long Sleeve](https://m.media-amazon.com/images/I/711EhV4jYaL._AC_SR768,1024_.jpg)
![Green Arc'teryx Taema Thermal Crew Long Sleeve](https://m.media-amazon.com/images/I/91dBS1JHThL._AC_SR768,1024_.jpg)
![Navy Under Armour UA Tac Tech Long Sleeve Tee](https://m.media-amazon.com/images/I/611ywNcdtIL._AC_SR768,1024_.jpg)
![Navy Under Armour UA Tac Tech Long Sleeve Tee](https://m.media-amazon.com/images/I/813SCjvdJBL._AC_SR768,1024_.jpg)
![Gray Smartwool Merino 250 Base Layer Crew](https://m.media-amazon.com/images/I/81kZcjtnlfL._AC_SR768,1024_.jpg)
![Gray Smartwool Merino 250 Base Layer Crew](https://m.media-amazon.com/images/I/91HCB80r+3L._AC_SR768,1024_.jpg)
![Black Under Armour Packaged Base 3.0 Crew](https://m.media-amazon.com/images/I/71brbITI41L._AC_SR768,1024_.jpg)
![Black Under Armour Packaged Base 3.0 Crew](https://m.media-amazon.com/images/I/71jMePxI+FL._AC_SR768,1024_.jpg)
Low Stock
![Black Hot Chillys Kids Micro-Elite Chamois Crew Neck (Little Kids/Big Kids)](https://m.media-amazon.com/images/I/81uS0z-CwxL._AC_SR768,1024_.jpg)
Low Stock
![Black Icebreaker 260 Tech Merino Baselayer Long Sleeve Crewe](https://m.media-amazon.com/images/I/71LUUskvRNL._AC_SR768,1024_.jpg)
![Black Icebreaker 260 Tech Merino Baselayer Long Sleeve Crewe](https://m.media-amazon.com/images/I/91+BDk2P28L._AC_SR768,1024_.jpg)
Low Stock
![Black Hot Chillys Kids Pepper Skins Crew Neck (Toddler/Little Kids/Big Kids)](https://m.media-amazon.com/images/I/810rnR4Yu+L._AC_SR768,1024_.jpg)
![Black Hot Chillys Kids Peachskins Turtleneck (Little Kids/Big Kids)](https://m.media-amazon.com/images/I/81sJwygLswL._AC_SR768,1024_.jpg)
Low Stock
![Blue Hot Chillys Clima-Trek Crew Neck](https://m.media-amazon.com/images/I/71ZnorS5RYL._AC_SR768,1024_.jpg)
![Blue Hot Chillys Clima-Trek Crew Neck](https://m.media-amazon.com/images/I/717uaPob8eL._AC_SR768,1024_.jpg)
Low Stock
![Black Hot Chillys Peach Solid Roll T-Neck](https://m.media-amazon.com/images/I/81ytqOhBQ8L._AC_SR768,1024_.jpg)
![Black Hot Chillys Peach Solid Roll T-Neck](https://m.media-amazon.com/images/I/81hJDVRE0aL._AC_SR768,1024_.jpg)
![Black Under Armour Base Crew 3.0](https://m.media-amazon.com/images/I/61y8V6qtKeL._AC_SR768,1024_.jpg)
![Black Under Armour Base Crew 3.0](https://m.media-amazon.com/images/I/71ZryktW3mL._AC_SR768,1024_.jpg)
![Tan Icebreaker Siren Merino Long Sleeve Sweetheart](https://m.media-amazon.com/images/I/61bH-KKty7L._AC_SR768,1024_.jpg)
![Gray Icebreaker Merino 260 Tech Long Sleeve Half Zip](https://m.media-amazon.com/images/I/81-qfgX3yKL._AC_SR768,1024_.jpg)
![Gray Icebreaker Merino 260 Tech Long Sleeve Half Zip](https://m.media-amazon.com/images/I/91x78Y7YH0L._AC_SR768,1024_.jpg)
![Black Hot Chillys Pepper Skins Crew Neck](https://m.media-amazon.com/images/I/61OS4OqjX9L._AC_SR768,1024_.jpg)
![Black Hot Chillys Pepper Skins Crew Neck](https://m.media-amazon.com/images/I/71EmJKK6dRL._AC_SR768,1024_.jpg)
Low Stock
![Navy Helly Hansen Lifa Merino Midweight Graphic](https://m.media-amazon.com/images/I/81oKvKM5ZNL._AC_SR768,1024_.jpg)
![Navy Helly Hansen Lifa Merino Midweight Graphic](https://m.media-amazon.com/images/I/81l691-hWFL._AC_SR768,1024_.jpg)
![Blue Hot Chillys Peach Skins Roll T-Neck](https://m.media-amazon.com/images/I/61Rw81OOKVL._AC_SR768,1024_.jpg)
![Blue Hot Chillys Peach Skins Roll T-Neck](https://m.media-amazon.com/images/I/719O+0JiI2L._AC_SR768,1024_.jpg)
![Blue Hot Chillys Peach Skins Solid Crew](https://m.media-amazon.com/images/I/61eEgrFMi0L._AC_SR768,1024_.jpg)
![Blue Hot Chillys Peach Skins Solid Crew](https://m.media-amazon.com/images/I/71Nc27R7b6L._AC_SR768,1024_.jpg)
![Black Hot Chillys Kids Bi-Ply Crewneck (Toddler/Little Kids/Big Kids)](https://m.media-amazon.com/images/I/81H9HEcrq9L._AC_SR768,1024_.jpg)
Low Stock
![Black Columbia Midweight Stretch Long Sleeve Half Zip Top](https://m.media-amazon.com/images/I/61BHU9xyvoL._AC_SR768,1024_.jpg)
![Black Columbia Midweight Stretch Long Sleeve Half Zip Top](https://m.media-amazon.com/images/I/71WdUPjwL5L._AC_SR768,1024_.jpg)
![Purple Hot Chillys Peachskins Crew Neck](https://m.media-amazon.com/images/I/81xg9iisozL._AC_SR768,1024_.jpg)
![Purple Hot Chillys Peachskins Crew Neck](https://m.media-amazon.com/images/I/71diXdHq8lL._AC_SR768,1024_.jpg)
![Black Icebreaker 200 Oasis Merino Baselayer Long Sleeve Crewe](https://m.media-amazon.com/images/I/81Oge130+VL._AC_SR768,1024_.jpg)
![Black Icebreaker 200 Oasis Merino Baselayer Long Sleeve Crewe](https://m.media-amazon.com/images/I/81dfeXYJq8L._AC_SR768,1024_.jpg)
![Black Smartwool Classic All-Season Merino Base Layer 1/4 Zip](https://m.media-amazon.com/images/I/616soOCIk8L._AC_SR768,1024_.jpg)
![Black Smartwool Classic All-Season Merino Base Layer 1/4 Zip](https://m.media-amazon.com/images/I/71DEJMe0-ML._AC_SR768,1024_.jpg)
![Black Smartwool Thermal Merino Rib Top](https://m.media-amazon.com/images/I/61gzmEUfpIL._AC_SR768,1024_.jpg)
![White Hot Chillys Peachskins Crew Neck](https://m.media-amazon.com/images/I/81MOxy5hTVL._AC_SR768,1024_.jpg)
![White Hot Chillys Peachskins Crew Neck](https://m.media-amazon.com/images/I/71SYzXKQEJL._AC_SR768,1024_.jpg)
Low Stock
![Gray Hot Chillys Clima-Wool Crew](https://m.media-amazon.com/images/I/71Fal6Nv-3L._AC_SR768,1024_.jpg)
![Gray Hot Chillys Clima-Wool Crew](https://m.media-amazon.com/images/I/91udVy9uGEL._AC_SR768,1024_.jpg)
Low Stock
![Black Spyder Chute Turtleneck](https://m.media-amazon.com/images/I/61RsOh1ZY1L._AC_SR768,1024_.jpg)
![Black Spyder Chute Turtleneck](https://m.media-amazon.com/images/I/71fe-n4PvPL._AC_SR768,1024_.jpg)
Low Stock
![Blue Smartwool Classic Thermal Merino Base Layer Crew](https://m.media-amazon.com/images/I/71QJBvqTTDL._AC_SR768,1024_.jpg)
![Blue Smartwool Classic Thermal Merino Base Layer Crew](https://m.media-amazon.com/images/I/81YtCwkVwNL._AC_SR768,1024_.jpg)
Low Stock
![Black Under Armour Base 4.0 Crew](https://m.media-amazon.com/images/I/61C7keiLfiL._AC_SR768,1024_.jpg)
![Black Under Armour Base 4.0 Crew](https://m.media-amazon.com/images/I/714Tq5DIagL._AC_SR768,1024_.jpg)
Low Stock
![Gray Hot Chillys Micro-Elite Chamois Crew Neck](https://m.media-amazon.com/images/I/91nd72JBxJL._AC_SR768,1024_.jpg)
![Gray Hot Chillys Micro-Elite Chamois Crew Neck](https://m.media-amazon.com/images/I/91s5PeSjX1L._AC_SR768,1024_.jpg)
![White Hot Chillys Micro-Elite Chamois Crew Neck](https://m.media-amazon.com/images/I/71E984jg3aL._AC_SR768,1024_.jpg)
![White Hot Chillys Micro-Elite Chamois Crew Neck](https://m.media-amazon.com/images/I/715lMHZm3LL._AC_SR768,1024_.jpg)
Low Stock
![Black Smartwool Classic All-Season Merino Base Layer 1/4 Zip](https://m.media-amazon.com/images/I/61EsOA8uaEL._AC_SR768,1024_.jpg)
Low Stock
![Black Dale of Norway Vail Baselayer 1/2 Zip](https://m.media-amazon.com/images/I/710mGB9FllL._AC_SR768,1024_.jpg)
![Black Dale of Norway Vail Baselayer 1/2 Zip](https://m.media-amazon.com/images/I/71HUETA+yjL._AC_SR768,1024_.jpg)
![Green Icebreaker Oasis Mid-Weight Merino Long Sleeve Crewe](https://m.media-amazon.com/images/I/71tneUUDOkL._AC_SR768,1024_.jpg)
![Green Icebreaker Oasis Mid-Weight Merino Long Sleeve Crewe](https://m.media-amazon.com/images/I/91ot8h4jYqL._AC_SR768,1024_.jpg)
![Gray Icebreaker 200 Zoneknit Long Sleeve Crew](https://m.media-amazon.com/images/I/711THYG0g9L._AC_SR768,1024_.jpg)
![Gray Icebreaker 200 Zoneknit Long Sleeve Crew](https://m.media-amazon.com/images/I/81tr9q2B5DL._AC_SR768,1024_.jpg)
![Black Hot Chillys Peach Zip-T](https://m.media-amazon.com/images/I/81D8B7TwFlL._AC_SR768,1024_.jpg)
![Black Hot Chillys Peach Zip-T](https://m.media-amazon.com/images/I/8188iSXrNaL._AC_SR768,1024_.jpg)
Low Stock
![Black Smartwool Classic Thermal Merino Base Layer 1/4 Zip Plus](https://m.media-amazon.com/images/I/61bTRquEWZL._AC_SR768,1024_.jpg)
![Black Smartwool Classic Thermal Merino Base Layer 1/4 Zip Plus](https://m.media-amazon.com/images/I/81MfngQdbkL._AC_SR768,1024_.jpg)
Low Stock
![Gray Icebreaker 260 Tech Merino Base Layer Long Sleeve Crewe](https://m.media-amazon.com/images/I/81yJlw-kMWL._AC_SR768,1024_.jpg)
![Gray Icebreaker 260 Tech Merino Base Layer Long Sleeve Crewe](https://m.media-amazon.com/images/I/911L--HAbhL._AC_SR768,1024_.jpg)
Low Stock
![Black Smartwool Plus Size Classic Thermal Merino Base Layer Crew](https://m.media-amazon.com/images/I/61czrGEcVXL._AC_SR768,1024_.jpg)
Low Stock
![Pink L.L.Bean Wicked Warm Midweight Underwear Top (Big Kids)](https://m.media-amazon.com/images/I/81pQdct4VnL._AC_SR768,1024_.jpg)
Low Stock
![Blue Icebreaker Oasis Short Sleeve Crewe](https://m.media-amazon.com/images/I/71LRV6cIzDL._AC_SR768,1024_.jpg)
![Blue Icebreaker Oasis Short Sleeve Crewe](https://m.media-amazon.com/images/I/716r0xzG2zL._AC_SR768,1024_.jpg)
Low Stock
![Black Hot Chillys Crewneck Peachskins](https://m.media-amazon.com/images/I/81Z+4m3x-mL._AC_SR768,1024_.jpg)
![Black Hot Chillys Crewneck Peachskins](https://m.media-amazon.com/images/I/81pf70X65ZL._AC_SR768,1024_.jpg)
Low Stock
![Black Smartwool Intraknit Active Base Layer Long Sleeve](https://m.media-amazon.com/images/I/61dPJzHPL0L._AC_SR768,1024_.jpg)
![Black Smartwool Intraknit Active Base Layer Long Sleeve](https://m.media-amazon.com/images/I/71oBI+X-xEL._AC_SR768,1024_.jpg)
Low Stock
![Multi Smartwool Plus Size Classic All-Season Merino Base Layer Long Sleeve](https://m.media-amazon.com/images/I/71i6pLnKX4L._AC_SR768,1024_.jpg)