Comlax Says: This is a lighter helmet than previous versions and the design is a mix between the original CPX and the popular Pro7 model. As you look at the shell, the ridge on the back is to help balance the overall weight of the helmet, creating better weight distribution instead of making the helmet front-heavy, which was an issue in the Pro 7 with certain customers we heard from. The inside uses the same technology as the Pro 7 with the SevenTech liner system - a must have to prevent concussions. The helmet can be adjusted from XS all the way up to XL, so no more worrying about holding onto size pads! Please call COMLAX @ 1-888-548-4529 for custom orders.