evo.com | Smartwool Long Underwear Tops > The Smartwool Intraknit Thermal Merino Base Layer Hoodie harnesses merino wool's natural temperature-regulating magic to keep you dialed in, whether you're sending it down the mountain or stretching out after a chilly morning snowshoeing session. Built for those who refuse to let cold weather dictate their adventures. 78% Merino Wool / 18% Polyester / 3% Elastane / 1% Polyamide Intraknit(TM) Technology Insulation, articulation, and ventilation are seamlessly integrated to help with movement and comfort during high-intensity activities. 3D Mapping Results in Near Custom Fit and Freedom of Movement Slim Fit Smartwools' slim fit is intended to follow the contours of the body. Seamlessly Knit Mesh Ventilation | Smartwool Intraknit Thermal Base Layer Hoodie Men's 2026 - X-Large Black | Wool/Elastane/Polyester