Smartwool Classic Thermal Merino Base Layer 1/4 Zip Boxed Charcoal Foggy Pines 2026

The men’s thermal top with a high collar, Smartwool Men’s Classic Thermal Merino Base Layer ¼-Zip, is part of Smartwool’s winter Classic Thermal collection, characterized by high density and excellent performance during winter mountaineering, skiing, alpine climbing, and even running in the coldest months of the year. Made from 100% merino wool with a weight of 250 g/m², this top provides comfort without overheating while effectively retaining warmth in very cold conditions—even at temperatures below -4°C.

The Classic Thermal collection from Smartwool is designed to provide maximum warmth and comfort in cold weather. All products are made from 100% high-density merino wool (250 g/m²), with the fabric treated to be soft and pleasant to the touch. This collection represents the brand’s dedicated winter line, created for intense activities in the high mountains when temperatures drop below zero.

The men’s thermal top with a high collar, Smartwool Men’s Classic Thermal Merino Base Layer ¼-Zip, is a stretchy, breathable, and warm garment intended to serve as the first layer against your skin under a fleece or hardshell jacket while practicing your favorite mountain sports. Made from 100% high-density merino wool (250 g/m²), it is ideal for winter use in skiing, snowboarding, ski touring, winter camping, and more. Merino wool stands out from all other natural fabrics with its ability to maintain optimal thermoregulation—it retains warmth in cold weather and feels cool against the skin when temperatures rise. Even when you sweat, you won’t feel discomfort, as the wool continues to provide warmth while damp. Thanks to its natural antibacterial properties, merino wool prevents the build-up of unpleasant odors, and since the fabric does not wrinkle and requires no ironing, this top needs minimal care.

The design of this Smartwool thermal top includes all the essential details for active movement—the cut follows the natural lines of the body, flatlock seams and shoulder panels prevent chafing, and the high collar with a zipper allows you to regulate ventilation according to the conditions. In cold weather, the collar protects the chest and neck from overcooling, while in warmer moments, you can simply unzip it for a refreshing flow of air.

The men’s thermal top with a high collar, Smartwool Men’s Classic Thermal Merino Base Layer ¼-Zip, is an excellent choice for winter outdoor adventures, combining durability, strength, and high elasticity with the perfect thermoregulation of merino wool.