Clarino is one of the most durable man made synthetic leathers on the market. Extra Small: 8 - 8.5cm (3.15" - 3.34"). Extra Large: 10-10.5cm (3.93" - 4.13"). Pre curved Clarino palm makes for superior wear without sacraficing feel and are also form fitting so there is no bunching or blistering while featuring full breathability and flexibility.