Material: Nylon; Rubber Sponge palm pads are Ergonomically designed to protect the palm and improve flexibility as well as comfort. The rubber of Gloves; edge protects main joints whereas the palm of glove has an anti-skid rubber material to ensure ideal grip. With sticking buckle design, size can be adjusted. Suitable for driving, barbell, dumbbell, rowing, weightlifting, tug-of-war, and various kinds of sports fitness and circumference 16.5cm to 20.5cm / 6.49 inch to 8.07 inch approx.