This bag is made with fluorescent leather, a thicker material than usual suede, which also means a longer break in time. This is the footbag for after hours. Extend your kicking hours with this amazing footbag. The Radiation is a great footbag, it is similar to a glow in the dark frees-bee, you put it under a light for a couple of seconds and it will glow enough for you to play in the dark or in an area with bad lighting..