Atlas Brace Technologies Tyke Batman Neck Brace (Yellow, Small) Split-Flex Frame: Vertical flex is the Holy Grail of mobility and comfort; Our split frame helps mimic natural body movements to create the best experience possible Jr. Smart Mounts: Hidden inside the mounting area are dual mounting holes to allow for 8mm of adjustment; Simply remove each axle & switch holes to adjust Height Adjustment: Choose from 2 possible height adjustments to create the best fit for your body type and helmet choice Sternum Free: All new chest support design is stronger, lighter, more compatible with chest protectors, and still sits around your sternum Feather Weight (450 grams): The most amazing thing about wearing it is that you forget you're wearing it; Surface Area: By sitting on 27% more of the body than the competition, comfort is maximized, and forces are distributed more efficiently over the body