Size Chart No matter the distance, the Run Sock 2.0 offers maximum benefits. The flagship product in the CEP line-up, these socks are the defining performance product in the compression category. CEP's proprietary compression profile improves blood flow, reduces muscle soreness and quickens recovery time. Features: - 20-30 mmHg from ankle to calf, 18 mmHg consistent compression over the calf - Special design activates the flow of blood in the muscles - Perfect anatomical fit - Highest quality materials and premium craftsmanship for extreme durability - Microfiber technology for superior comfort - Extra-flat toe seam - Optimum recovery and performance - Maximum stability for muscles and joints to help prevent injuries - Heat and moisture management thanks to hydrophilic design - Open-pore mesh structure in the calf for excellent ventilation - Antibacterial, odor-reducing properties - Padded zones to relieve pressure where it's needed most - 85% Nylon (Polyamide), 15% Spandex