OS1st FS4+ Over The Calf Compression Socks are designed for both performance and recovery. The proprietary design features FS6 technology for swelling and plantar fasciitis relief, plus Compression Zone Tech for enhanced support. Medical grade 20-30mmHg graduated compression helps reduce varicose veins, Achilles tendonitis, and shin splints. The ultra-soft micro-fiber nylon is treated with Silver-Ion tech to keep you dry and odor-free, and the Y-Gore Heel ensures a secure fit. Enjoy comfort, support, and fewer days of rest with the FS4+ OTC Pickleball Compression Socks from OS1st.