Smartwool Intraknit Thermal Merino Base Layer Men's 1/4 Zip

The Intraknit Thermal Merino 1/4 Zip is Smartwool’s most advanced cold-weather base layer, blending Merino wool and polyester for warmth, breathability, and precision-mapped comfort. It’s built for high-output days on snow where temperature regulation and unrestricted movement are key.

Why we like it:

We like this piece for how it manages warmth and moisture without bulk. The Intraknit™ technology creates body-mapped ventilation zones that move with you, making it a top performer for touring or layering under shells.

Features and Functions:

Constructed from 52% Merino wool and 45% polyester, this 1/4 Zip uses seamless 3D mapping and mesh ventilation zones to balance warmth and breathability. The articulated knit moves naturally while minimizing seams to reduce chafing.

Fit and Sizing:

Slim fit follows the body’s contours for efficient layering. Runs true to size for most skiers seeking an athletic fit.

Bottom Line:

A high-performance merino base layer for skiers who demand warmth, comfort, and technical precision in one streamlined layer.