FITS™ products are designed to be the best fitting performance outdoor socks in the industry. Over 100 years of experience has taught us to recognize the importance of careful, precise sock-fitting based more on total foot volume than foot length. All FITS™ deliver unique benefits – thanks to superior construction, the highest quality materials, and innovative design. Our socks are constructed from two-ply, compact-spun, ultra-fine Merino Wool, providing the ultimate blend of softness and durability. Our F3 Technology™ delivers a unique form FITthanks to a deep heel pocket, specialized toe seam, and contoured leg – which keep FITS socks firmly in place. This means no more bunching, hot spots, or friction, regardless of the task at hand.