Smartwool Men's Classic Thermal Merino Base Layer 1/4 Zip 2026 Charcoal Heather

Constructed from 100% responsibly sourced Merino wool, the Smartwool Men’s Classic Thermal Merino Base Layer 1/4 Zip provides heavyweight warmth while naturally regulating temperature and managing moisture. Its interlock knit delivers soft, durable performance for cold-weather skiing, hiking, or running.

The slim fit tracks the body for efficient layering, and strategically placed flatlock seams with offset shoulders reduce chafing during movement. A 10-inch center-front zipper offers quick ventilation when intensity rises, making the Smartwool Classic Thermal Merino 1/4 Zip a dependable, technical choice for extended winter activity.

Key Features

• Fabric & Construction: Interlock knit, 100% responsibly sourced Merino wool
• Fit: Slim fit designed to follow body contours
• Seams: Flatlock seam construction with offset shoulder and side seams

Additional Features

• Side seams wrap to the front to reduce chafing

Information provided by manufacturer