Pull On closure Engineered For Performance And Extreme Comfort: Feetures engineers products for the body in motion. Our Merino+ socks combine our Elite technology with our unique blend of super fine merino wool and silky soft rayon from bamboo as well as a seamless toe that provides truly unsurpassed comfort. High Density Knitting: High density knitting results in lightweight cushion. Temperature Control: Merino+ fibers wick moisture to keep feet dry and odor-free. These socks insulate when wet which keeps feet warm in cool and damp conditions. Anti-Odor: Our Merino+ fibers have natural anti-odor properties, perfect for any athlete. Lifetime Guarantee: Feetures stands behind the quality of their socks and wants you to have a great experience with every product they make. If at any point you are unsatisfied with one of their products, you may return it for a replacement or a refund.