The Street Knee Open Back Pad (Youth) offers great protection for the pad wearer who wants non-bulky knee pads. The low profile. ultra-flexible body is perfect for street. park. and learning new tricks. Locked in EVA foam. a combination of thick and thin padding with an ergonomic design that locks in your elbows for optimal fit and maximum protection. Ballistic Nylon. ultra-tough ballistic nylon that resists tears and protects your elbows from skids and scrapes. Perforated Neoprene. allows for better ventilation keeping you cool and dry.