Smartwool's Men's Intraknit(TM) Thermal Merino Base Layer Hoodie is a lightweight, flexible top with a helmet-compatible hood that's made for your most extreme cold-weather activities. Merino wool yarns and gender-specific ventilation are perfectly placed to maximize thermoregulation and breathability during high-intensity activities, and the 3D mapping results in near custom fit and freedom of movement. When you're in our best base layers, you're ready for anything. Design: Intraknit(TM) Thermal Merino: Smartwool's most advanced performance base layer is 3D-knit to provide a tailored fit with mesh ventilation to balance warmth and breathability. Fit: Slim - intended to follow the contours of the body Featuring Intraknit(TM) technology: Insulation, articulation, and ventilation are seamlessly integrated to help with movement and comfort during high-intensity activities Seamlessly knit mesh ventilation 3D mapping results in near custom fit and freedom of movement Helmet-compatible hood and extended collar Thumbholes at cuffs Additional Details Made in India: 78% Merino Wool, 18% Polyester, 3% Elastane, 1% Polyamide. Exclusive of Decoration