The S1 Premium Helmet has super comfy DLX liners that absorb sweat. *****WARNING**** The S1 Premium Helmet does not meet any impact test requirments and is considered a minimal impact helmet. S1 suggests that you wear a certifed helmet no matter what wheels you ride. We especially discourage anyone who plays Roller Derby to rock this helmet as Roller Derby is a contact sport and the higherst level of head protection is needed for this sport. Please take a look at our Lifer helmet series if you are looking for a helmet for Roller Derby.