I won this in a comp and i already have a helmet so no need to keep it! Hit me up with trade offers and what not. It is the Certified Sandbox model. Size is L/XL and when the largest padding is in it is to tight and when the smallest padding is in, it works with a hat. so the sizing is pretty versatile.there is 3 different padding sizes. I wear a XL for reference. +K for bumps