Ultra-light no-show Merino wool running socks, from Darn Tough. The Darn Tough Run No-Show an invisible trainer sock, specifically designed for active feet and perfect for race day. Constructed with a fine gauge knit, the Vertex uses a blend of nylon, Merino wool and lycra to provide a naturally moisture wicking, breathable and anti-microbial sock.A performance fit, achieved through a high density knit, ensures the socks wont slip, bunch or rub, providing long lasting comfort in all conditions. For added comfort, True Seamless technology gives an ultra-soft invisible feel so you may even forget youre wearing socks at allDarn Tough are so confident in the quality of their socks, they offer a lifetime guarantee. Run in complete comfort with the Run No-Show Socks from Darn Tough.