Lupo Women's Essential No Slip Crossover Yoga Pilates Barre Socks, Large Black 62% Cotton / 35% Nylon / 3% Other Imported Crossover strap for extra firm positioning Swirled fashion non slip grip pattern for firm positioning and extended sock life Carefully designed heel pocket to stop sock from slipping down Optimum mix of polyamide and cotton for softness and dryness. Thin all over feel to allow better positioning in barre, yoga and pilates Comes is three sizes: Womens One-Size 5 to 9.5, Medium 4.5 to 8 and Large 8.5 to 11.5+