The 1000 Mile Compression Sock minimises muscle fatigue & soreness, enabling faster muscle recovery after exercise or injury. It manages to achieve this by reducing the build-up of lactic acid, accelerating blood circulation & preventing muscle oscillation. The graduated compression accelerates blood circulation, aiding muscle recovery & reducing toxins, while the arch & ankle bracing offer extra support, & the ultra-flat toe seam & fitted heel add additional comfort. Content: 47% Tactel, 37% Nylon, 15% Elastane Lycra, 1% Polypropylene. Fitting: 1. Roll sock back on itself & slide it onto your foot, checking heel is in correct position. 2. Using both hands, stretch sock widthways & gradually unroll it up your leg. Avoid pulling on the fabric as much as possible. 3. Smooth out any wrinkles in the fabric by rubbing on your calf.