(ALL 4 COMES IN 1 PACK) breathable mesh fabric which is naturally quick-drying. (Washable)
Small - 4.3" height - 4.3" elastic at each end, looped
Medium - 4.9" height - 4.7" elastic at each end, looped
Large - 5.5" height - 5.1" elastic at each end, looped 
Extra-Large - 6.1" height - 6.3" elastic at each end, looped