StopSocks are the world's best grip socks! - Engineered and tested in Colorado, USA! They feature a nonskid, traction rubber sole which helps prevent falls, enhances your performance, and gives you sure footing on hard wood, tile, gym, and other slippery floors. Perfect for megaformer, yoga, the gym, athletics, post-surgery, airport and traveling or wearing around the house. Anti-slip gripper socks provide the safety of a shoe with the comfort of a sock! Colors: Grey/Black/Yellow Tread Pattern in Large and Blue/Grey/Black/Blue Tread Pattern in Medium and Large. Available in these sizes: Ankle Blue in Large = Women's 9-13 and Men's 8-12, Blue in Medium = Kid's 3-6 or Women's 4-8 and Large = Women's 9-13 and Men's 8-12, Yellow in Large = Women's 9-13 and Men's 8-12. Materials: 90% Polyester / 10% Spandex. Machine Washable. Mid-calf height assures socks fit firmly on your feet. Soft tread grip is great for seniors who need that added anti-slip fall prevention security. Also great for children who need non-skid socks in the house or on the trampoline. USAGE GUIDELINES: As different people can have unique physical attributes, and as with any apparel item in any category, there is no way to ensure sizing will be a perfect fit for every individual. StopSocks may not be suited for people with more intensive medical conditions, including edema, more severe skin conditions or people who may have enlarged or larger feet, ankles and lower legs.