Method for choosing the size,According to palm Length+palm circumference refer to left size chart. Centimeter data has less deviation than inch data.Measure palm Length: Measure the length of your hand from the base of your palm to the tip of your middle finger. Measure palm circumference: Wrap a measuring tape tight around your knuckles to measure the circumference of your hand. Youth XS(palm length 5.79"-6.1",14.7-15.5|palm circumference 5.71"-6.1",14.5-15.5); Youth S(palm length 6.06"-6.38",15.4-16.2|palm circumference 5.91"-6.5",15-16.5); Youth M(palm length 6.38"-6.69",16.2-17|palm circumference 6.3"-6.69",16-17); Youth L(palm length 6.69"-7.01",17-17.8|palm circumference 6.5"-7.09",16.5-18); Youth XL(palm length 7.01"-7.28",17.8-18.5|palm circumference 6.89"-7.28",17.5-18.5); Adult S(palm length 7.01"-7.44",17.8-18.9CM|palm circumference 7.28"-8.07",18.5-20.5CM); Adult M(palm length 7.36"-7.76",18.7-19.7CM|palm circumference 7.68"-8.46",19.5-21.5CM); Adult L(palm length 7.64"-8.11",19.4-20.6CM|palm circumference 8.07"-8.86",20.5-22.5CM); Adult XL(palm length 7.99"-8.39",20.3-21.3CM|palm circumference 8.66"-9.45",22-24CM); Adult XXL(palm length 8.27"-8.66",21-22CM|palm circumference 9.25"-10.04",23.5-25.5CM); Adult XXXL(palm length 8.46"-8.94",21.5-22.7CM|palm circumference 9.84"-10.63",25-27CM); Vulnerable part on the palm and back of hand covered by carbon fiber and TPR rubbers for impact protection;Stretch zone on finger joints for comfort and improved fingers moving dexterity; Reflective print on back of hand for driving in darkness safe; Anti-slip print on the upper palm and fingers for slip resistant ability; New hook and loop closure with TPR rubber on the wrist for perfect secure fit;Touchscreen sensitive on both index finger tips; Perforated goatskin leather on back of hand for maximum breathability The Seibertron SPS-2 Glove spares no expense in providing extreme durability and coverage from the fingers to the cuff. The molded carbon fiber knuckle and TPR finger armor protect from rocks and branches, and the extended hook and loop cuff keeps your wrist safe from all but the heaviest of impacts. Molded carbon fiber ballistic knuckle coverage; Compression molded cuff with hook & loop closure for a secure fit; Perforated goatskin leather top of hand for enhanced comfort and breathability; Double layer palm for enhanced comfort and durability; Touchscreen sensitive on both index finger tips; Silicone lever grip improved control