Thanks to the technically advanced Sock-Lock™ Support System, the foot and the sock become one. Constructed with Merino+, our special blend of silky soft rayon from bamboo and Merino wool, Feetures! Elite provides unsurpassed comfort. It"s The Ultimate Fit and Feel realized. Feetures! offers the first truly anatomical fit. Anatomical right and left foot design enhances fit to help eliminate blisters.The PerfectToe™ (No irritating toe seam.) enhances comfort and eliminates irritation. The Merino+ fibers wick moisture to keep feet dry and odor-free. Merino+ insulates when wet keeping your feet warm in wet, cool conditions.The Power Arch (Patent Pending) provides targeted support where it"s needed most and high-density cushioning provides extra protection in high impact areas.