evo.com | Smartwool Long Underwear Tops > The Smartwool Classic Thermal Merino Base Layer 1/4 Zip Top isn't just a baselayer, it's a stink-resistant lightweight champ, made for getting after it in the cold. Layer with ease thanks to this slim-fitting garment that features a 1/4 zipper and 100% breathable merino wool. Make sweating fun with the Smartwool Classic Thermal Merino Base Layer 1/4 Zip Top. Zipper Length Size Medium 8" (20 cm) Raglan Sleeves 100% Merino Wool Made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance. Slim Fit Slim fit is intended to follow the contours of the body Back Body Seam Wraps to Front of Body Enhancing Fit | Women's Smartwool Classic Thermal Base Layer 1/4 Zip Top 2026 - Large Orange