Start your layering system with SmartWool's most innovative foundation to date - theIntraknit collection. SmartWool® Men's Intraknit Thermal Merino Base Layer Bottom puts warmth first, while seamlessly knit mesh ventilation helps keep you dry and comfortable. Their revolutionary 3D mapping provides maximum mobility and ribbed elbows provide added durability, so nothing slows you down. Gear up to take on any weather. Featuring Intraknit™ technology: Insulation, articulation and ventilation are seamlessly integrated to amplify movement and comfort during high-intensity activities Merino Sport yarn combines the power of Merino Wool with the durability and fast dry times of Polyester Seamlessly knit mesh ventilation designed to keep you dry and comfortable 3D mapping provides maximum mobility while ribbed elbows provide added durability Slim Fit - intended to follow the contours of the body Made in India Product Features: Fabric:52% Merino Wool, 44% Polyester, 2% Elastane, 2% Polyamide Inseam:28.75" (73 cm) SmartWool Men's Intraknit Thermal Merino Base Layer Bottom