65% Polyamide, 25% Wool (Merino), 10% Spandex Imported CEP Outdoor Merino: Long athletic outdoor compression stockings provide a functional fit for hiking, trekking, and trail running. Explore difficult terrain confidently with the best supportive outdoor socks while reducing muscle fatigue and swelling. Support Socks: Say goodbye to shin splints. Outdoor Merino compression model contains the calf and stabilizes the ankle for increased coordination and accuracy. Padded cushioning and seamless toe-closure adds protection against blisters and hotspots. Graduated Compression: 20-30 mmHg compression from ankle to calf, while 18 mmHg consistent compression hugs the calf. Scientifically proven to increase circulation by up to 40%. Keeping you light on your feet and less fatigued on the longest days. Comfort & Quality: Our finest blend of merino wool is optimized for strength and durability. This lightweight, breathable sock is perfect for keeping skin cool, dry, and comfortable. CEP Outdoor Merino is the best sock for outdoor adventures, period. 65% Polyamide, 25% Wool (Merino), 10% Spandex