This Boot is made from our Number : 1 technology...made of high density high modulus carbon fiber along with the new gold 7075 t6 anodized mounting blocks. It comes with the newer softer more durable liner material. To date this is the most expensive stock boot we have ever made. It is crazy stiff and super light. Size 10 weighs 330 grams approximately. we can make them much lighter but the top skaters can sprint at 50 mph plus and we don't wanna take any chances. We used a little extra 40 grams of carbon and epoxy in the high stress areas, Making this boot the Fastest, Strongest and Lightest Inline speed Skating boots you will ever see.