NEW & IMPROVED OTC Heavy Wool BEAST (Style#4340)– Our High Volume Sock perfect for missions in Warm to Extreme Cold Climates. Blended yarns provide moisture movement helping keep feet dry & cool. Merino Wool naturally battles bacteria helping eliminate foot odor & also aids in prevention of blisters. Give Covert Wool BEAST a Go on your next mission, Go Covert! Construction Materials 70% Natural USA Merino Wool helps: * Naturally FR * Wick Moisture * Keep feet dry and comfortable * Reduce blisters * Reduce heat in boot/shoe 8% Wicking Acrylic & 20% Stretch Nylon helps: * Transfer Moisture * Reduces Friction * Keep feet cooler * Add more durability 2% Spandex Lycra® helps provide: * Comfortable Form Fit * 3-D All Day Support * No Bunching or wrinkles Sock Features * Stay Up Over-The-Calf Top w/ Hugging Support All Day * High Volume Cushioning for Maximum Insulation * Reinforced Achilles Protected by Nylon & Polypropylene * Dense Wool Cushion in High Strike Zones (heel pad and toe) for relief of High Impact * Special Super-Washed Merino Wool fights Friction & Hot Spots & Aids in Prevention of Blisters * Silver-Lining helps prevent foot odor & battle bacteria * Built - In Arch Support made for the long haul, * Special Deep Heel for better fit to the contour of the Ankle * Instep Flex-Zone built to prevent bunching of the sock.