Bottom of the sock is made of stretchable neoprene material with heel to toe power traction and dot rubber designed bottom and upper part is made of extra supportive four way compression material. Rubber GRIPPY Texture nonslip sole for enhanced grip. Great product for stand up and ground work, an excellent product for all martial arts, popular among Wrestling, Grappling and Jiu Jitsu practitioners. Very comfortable and lightweight, easy to wear on and off, also recommended to use under shin guards. Sold in Pairs. Able to be worn on the mat or the cage with or without shoes, it will enhance each martial arts session. Making sure you get the most out of your training by providing you with enhanced grip, movement, agility as well as offering support and protection for your ankle area. Sizes: XXX-Small (Shoe 1-2.5), XX-Small (Shoe 3-3.5), X-Small (Shoe 4-5.5) Small (Shoe 6 - 7.5), Medium (Shoe 8-9), Large (Shoe 9.5-11), X-Large (Shoe 11.5-13), XX-Large (Shoe 13+). Returns on this item for defects only