Sockwell's Herringbone Firm Compression socks are a simple but essential assortment of patterned knee highs. Spun with a yarn blend of fine Merino wool and rayon from bamboo with great arch support and seamless toe closure, these socks feel as good as they look. Firm Compression (20-30 mmHg) is made for extra circulatory support during exercise and recovery, travel, or every day.