Sockwell Women's Pulse Graduated Compression SockGreat fit and very strong compression. The Sockwell Pulse Graduated Compression Sock will provide the compression graduated and will not strangle your knees. With wool blend which is much cooler than the synthetic blend sock, this will last you more than a 12 hour shift without feeling tired or discomfort. FEATURES: Style: SW42W 32% Merino Wool 32% Nylon 31% Bamboo Rayon 5% Spandex Made in the US Machine Wash Firm(20 30mmHg) Graduated Compression