Rock is our HiSpeed Sock for Rugged Terrain, Specifically for Long Hauls and Heavy Loads, holds its shape through high mileage days, and provides energizing support of muscles, High Loft resilient cushion in specific Strike zones help eliminate bruising of Foot bottom from rugged territory, Silver Lining fights bacteria all day, every day, Go covert, Content: 42 Combed Cotton, 19 Coolmax, 19 Acrylic, 2, 5 Silver Lining, 12, 5 NylonLycra, 5 Nylon, Stay up top with hugging support, Graduated support in leg for all day energizing circulation, Special heel for better fit, Buildin cushion impact absorbtion shin guard, Arch support extra support band knit in the Arch area aids in relieving Foot stressstrain, Ingrain Polypropylene for moisture movement; Silver Lining for antimicrobial protection and no hot spots, Hi Loft Acrylic and resilient polypropylene for shock protection, Leg:, Top = Welt construction for nonbinding fit, Body = Graduated Support in leg of Sock for all Day Energizing support of muscles, Looser at the top and snugger fit at ankle, Helps promote circulation up the leg from Foot, Shin Guard=Buildin cushion Impact absorbtion shin guard, Foot:, Instep = Vapor mesh allows the Foot to breath and stay cool without compromising protection, Heel = Y heel construction provides the best contouring fit for the heel, Foot Bottom = Blister Protection Hi Loft super soft Acrylic blended with Ingrain wicking Polypropylene, Moisture movement Ingrain Polypropylene moves moisture away from Foot bottom while soft acrylic helps keep feet dry, Antimicrobial Protection Silver Lining battles bacteria helping eliminates Foot odor throughout the entire garment, No Hot SpotsSilver Lining aids in storage and distribution of thermal energy efficiently and evenly, Radiates thermal energy very slowly, Transfers moisture quickly, Shock ProtectionHi Loft Acrylic and resilient polypropylene keeps cushion dense, standing and durable all day, Arch:, Arch support Extra support band knit in the Arch area aids in relieving Foot stressstrain throughout the day, Colors: Black, Sizes: 9 13, Made in USA, SKU: TCLGR1041