The Reebok 7K helmet features great protection and comfort for an affordable price The 7K features the same shell design as the rest of the Reebok line, but the 7k differs fro Reebok's 5k by offering a subshell. The subshell used is light, stiff, and breathable making the 7k helmet better ventilated and lighter than the 5k. This helmet is a solid option for any age or skill level!