Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip
![](https://cdn.shopify.com/s/files/1/0254/2370/8259/files/Screenshot2023-11-08163806_800x.png?v=1699599304)
We've updated the fit of our Men's Merino 250 Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of our heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minim
![](https://killingtonsports.com/cdn/shop/files/Smartwool-Mens-Classic-Thermal-Merino-Base-Layer-14-Zip-4.jpg?v=1696374006)
Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip – Killington Sports
![](https://www.backcountry.com/images/items/large/SWL/SWLZ91E/BLACHAHEA.jpg)
Smartwool Classic Thermal Merino Colorblock 1/4-Zip Top - Women's - Clothing
![](https://jaxgoods.com/cdn/shop/products/66-646740-6044890-image-1620469_640x640.jpg?v=1683235770)
Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip — JAXOutdoorGearFarmandRanch
Smartwool Men's Intraknit Thermal Merino Base Layer 1/4 Zip - SW016260, New to our innovative Intraknit™ line is the Men's Intraknit™ Thermal Merino
![](https://skis.com/files/store/items/lg/f/w/fw24-sma-sw016260-m37-model.jpg)
Smartwool Intraknit Thermal Merino Base Layer 1/4 Zip - Men's
![](http://highcountryoutfitters.com/cdn/shop/files/SW016373L32-1-p.jpg?v=1693434104)
/cdn/shop/files/SW016373L
![](https://jaxgoods.com/cdn/shop/files/SW016355K61-2-p_700x700.jpg?v=1695830810)
Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip — JAXOutdoorGearFarmandRanch
Mens Classic Thermal Merino Base Layer 1/4 Zip
![](https://cdn11.bigcommerce.com/s-ha7hv3uknh/images/stencil/1280x1280/products/16202/25915/7fb2b2daSmartwool%20Men's%20Classic%20All-Season%20Merino%20Base%20Layer%2014%20Zip%20-%20TWILIGHT%20BLUE%20-%20LG__24804.1706577112.png?c=2)
Smartwool Men's Classic All-Season Merino Base Layer 1/4 Zip
Our new and improved Women's Classic Thermal Merino Base Layer Pattern 1/4 Zip is here to bring you a better feeling, better performing, and
![](https://www.windrosenorth.com/cdn/shop/products/LIGRMOSC_900x.jpg?v=1666385408)
Smartwool Women's Classic Thermal Merino Base Layer Pattern 1/4 Zip (SW016373)
![](https://featheredfriends.com/cdn/shop/files/smartwool-classic-thermal-merino-base-layer-1-4-zip-womens-purple-iris-floral_1400x.jpg?v=1695942454)
Classic Thermal Merino Base Layer 1/4 Zip Women's – Feathered Friends