Intraknit Thermal Merino Base Layer Crew | 2026

Built for winter’s biggest days, this baselayer top is the go-to, next-to-skin layer for athletes who test their physical limits everyday. A strategically-knit blend of polyester and merino wool provides insulation, articulation and ventilation throughout the top. Smartwool also employs 3D body mapping to create an out-of-the-box custom fit that mimics your natural movements and never chafes under a backpack or other technical gear. Available in a wide range of sizes (S-2XL) and also offered in 1/4-zip and hoodie styles, this top easily fits into any layering system.