Size Reference Chart: S for Hand Palm Width: 7-8cm/ 2.75"-3.14"; M for Hand Palm Width: 7.5-8.5cm/ 2.95"-3.35"; L for Hand Palm Width: 8.5-9.5cm/ 3.35"-3.74"; XL for Hand Palm Width: 9-11cm/ 3.54"-4.33"; The impact resistant ABS plastic bones shell provides strong protection to the hand palm and the back of hands, bring you the best palm padding possible. Premium Lycra mesh fabric on both side and the inner cushion pad made it breathable and comfortable to wear, while provide extra protection to reduce vibration. Adjustable nylon straps on the palm and wrist provides the best wrist support while maintaining full range of movement of thumb and fingers. Easy take on and off shape design fits easily over any gloves or mitt, perfect for people of kids, youth and adult. Suitable for skating, skateboard, skiing, snowboard, roller sports, mountain biking and other outdoor sports. Product description The impact resistant ABS plastic bones shell provides strong protection to the hand palm and the back of hands, bring you the best palm padding possible. CTHPER Wrist Guards Double-Sided Hard Guard Brand: CTHOPER Size: S, M, L, XL Material: Plastic plate, Lycra, mesh fabric and sponge Color: Black Thickness: Moderate Security: Strong Flexibility: Moderate Breathability: Moderate Ski Classic Special Hand The CTHOPER wrist guard is with all aspects protection to the hand including the palm, the back of the hand and the wrist. The splint is flexible and impact resistant with the special holes support points design. The lycra fabric on both sides is breathable and comfortable to wear to avoid build of perspiration. It is adjustable with the two straps to make sure the snug fit and prevent slip. This kind of hand wrist guards perfect for skating, skateboard, skiing, snowboard, roller sports, mountain biking and other outdoor sports. How to measure hand's size? 1. Measure the width of the palm of hand at base of fingers from the index finger to the pinky finger. 2. four finger close, thumb out. Size Chart: Size S for palm breadth of 7-8cm/ 2.75"-3.14" Size M for palm breadth of 7.5-8.5cm/ 2.95"-3.35" Size L for palm breadth of 8.5-9.5cm/ 3.35"-3.74" Size XL for Hand Palm Width: 9-11cm/ 3.54"-4.33" Please check the Size Chart carefully and select the size of the most suitable for you. Please choose a bigger size, if you have fleshy palms or you need to wear it over gloves.