Please see the guidance under these charts to get the most accurate measurement. Nonetheless there are usually exceptions to the above chart, so please measure your foot and compare this to the size chart beneath. This size chart will assistance you operate out your helmet size for Pro-tec classic helmets. This size chart will assist you work out your helmet size for triple eight brainsaver helmets. These charts show the boot size vs plate size that the manufacturer recommends. Eg I put on a size 8 in Riedell boots but a size 9 in the Q4 and Q6. The sizing chart below is for these boots. We recoment that you do some investigation and if achievable attempt some skates with these plates before you get a pair.