COREFX Strength Loops are our elite strengthening bands. Made of polyester and latex, these 3" wide bands are slip resistant and sweat resistant. These strength loops assist in all kinds of workouts and exercises including squats, lunges, back kicks, leg presses and more. 2 sizes available. Small is 12.75" long and have a 20-50 lb resistance rating. Medium is 14.50" long and have a 25-50 lb resistance rating. Please specify Small or Medium.