New to Smartwool's innovative Intraknit™ line is the Men's Intraknit™ Merino 200 1/4 Zip. This Smartwool® base layer is 3D-mapped for a near-custom fit and freedom of movement. Its engineered construction helps enhance your performance with a lighter weight and cleaner finish. If you're looking for base layer clothing for cold weather, this one uses Merino Sport yarn that combines the power and benefits of Merino wool with the durability and fast dry times of polyester - creating the ultimate performance-ready top for all of your high-energy activities. Slim Fit Merino Sport yarn combines the power of Merino with the durability and fast dry times of polyester Engineered construction uses knit structures to enhance performance with lighter weights and cleaner finish Mesh ventilation seamlessly knit in gender-specific zones designed to keep the body dry and comfortable3D mapping results in near custom fit and freedom of movement while ribbed elbows provide added durability8.25" (21 cm) center front zipperKnit in India: 53% Merino Wool, 45% Polyester, 2% ElastaneGarment Weight: 218 g = 7.69 oz