Dynamic Full Face Skydiving HelmetDesign Designed with dynamic flying in mind and the need to have unrestricted movement and visibility in every position your head can turn The Dynamic comes in FOUR shell sizes to accommodate all head sizes, from tiny kids to giant heads! In order to keep the helmet as low profile as possible while improving the field of view, compared to the already wide Aero, we designed the helmet to have three shell sizes. After designing the main shell of most