PRO Compression: Trainer (Low-Profile) Compression Socks, Black, 2 Pairs, Large/X-Large 70% Polypropylene, 20% Nylon, 10% Lycra Spandex Made in US Promotes healthy blood flow, resulting in less fatigue and a faster, more efficient recovery Provides support to critical muscles and tendons, helping reduce inflammation and soreness Moisture control properties keep you dry, even during extreme activities Built-in "Stabilizer Zone" which helps promote balance and support Includes 2 pairs of under-ankle compression socks