The Smartwool Men’s Classic Thermal Merino Base Layer 1/4 Zip is a heavy-duty cold-weather essential designed for high-intensity winter activities. Made from 100% responsibly sourced Merino wool, it naturally manages moisture, regulates temperature, and resists odor, keeping you comfortable on the slopes or trails. Updated slim fit contours to the body, while flatlock seams and offset shoulder panels minimize chafing. The interlock knit provides durability and comfort, making this 1/4 zip ideal for skiing, hiking, running, and other cold-weather adventures.

Fit: Slim (follows body contours)

Fabric: 100% Merino Wool

Features:

• Fabric helps combine the moisture management, temperature regulation, and odor resistance of 100% Merino wool with interlock knit for comfort
• Flatlock seam construction and offset shoulder and side seams designed to help increase comfort and minimize chafing
• Side seams wrap to front

 

Men's Smartwool Apparel Size Chart

 

Size	Small	Medium	Large	X-Large	XX-Large
Chest	36”–38” 91.5–96.5 cm	39”–41” 99–104 cm	42”–44” 106.5–112 cm	45”–48” 114.5–122 cm	49”–51” 124.5–129.5 cm
Waist	29”–31” 73.5–78.5 cm	32”–34” 81.5–86.5 cm	35”–37” 89–94 cm	38”–40” 96.5–101.5 cm	41”–44” 104–112 cm
Hip	36”–38” 91.5–96.5 cm	39”–41” 99–104 cm	42”–44” 106.5–112 cm	45”–48” 114.5–122 cm	49”–51” 124.5–129.5 cm
Arm Length	31”–32” 78.5–81.5 cm	32”–33” 81.5–84 cm	33”–34” 84–86.5 cm	34”–35” 86.5–89 cm	35”–36” 89–91.5 cm
Inseam	30”–31” 76–78.5 cm	31”–32” 78.5–81.5 cm	32”–33” 81.5–84 cm	33”–34” 84–86.5 cm	34”–35” 86.5–89 cm