Socks 15-20 mmHg Medium compression, patented 5-layer arch support, dynamic energy return, and a patented achilles protection system—for when you know it’s gonna be a looong one. Details Medium compression, patented 5-layer arch support, dynamic energy return, and a patented achilles protection system—for when you know it’s gonna be a looong one. Knee high 15–20 mmHg compression Patented 5-layer arch support Y-Strap Energy Return System Patented achilles protection system Moisture-wicking and antimicrobial Left and right foot specific design Anti-cramp calf weave Medical Grade Compression Dynamic Recovery Antimicrobial