Smartwool PhD® Hunting Heavy Over the Calf The PhD® Hunt Heavy OTC will hike for days. Heavy cushioning and a breathable, odor-resistant Merino blend make sure the freshness lasts. Indestructawool technology ensures durability and comfort, and our 4 Degree elite fit system keeps the socks right where you want them. Features: Sock Height: Over the Calf Body-mapped mesh zones for added breathability Virtually Seamless toe for enhanced comfort Achilles strap provides extra protection and warmth Extra stretch in leg accommodates wide range of boot heights 14" overall height Made in USA of Imported Yarn: 69% Merino Wool, 30% Nylon, 1% Elastane Care: Machine Wash Warm, Wash Inside Out. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.