Atlas Brace Technologies Broll Rev Neck Brace (Black, Small) Hybrid Construction: Combining tough, durable foam with our hi-impact polymer allows for better impact force distribution specifically designed for low level impacts Low Level Impacts: Tough foam front construction is perfect for the low level impacts that young children experience, and provides excellent comfort during use Soft Sternum: Durable foam padding provides a cushioned force absorption system to protect your child from blunt helmet impacts and over extension of the neck; Chest Strap: A simple chest strap system is included to help fasten the Broll to your body Feather Weight (375 grams): The most amazing thing about wearing it is that you forget you're wearing it; Surface Area: By sitting on more of the body than the competition, comfort is maximized, and forces are distributed more efficiently over the body