Feetures! Elite Merino+ Ultra-Light Cushion Quarter Socks - Gray/Yellow Medium The PerfectToe&trade; (No irritating toe seam) 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 Ultra thin construction takes up minimal room inside the shoe