The Tattoo is as close as we could get to the feeling you might have if you dipped your feet in rubber. The upper is made from a supertough and breathable stretch nylon mesh wrapped in 1.0 mm Gryptonite™ rubber. The Tattoo feels like a rubber sock—it was designed for maximum flexibility and sensitivity. The top of the foot and the heel are covered with Gryptonite™ rubber which makes it sick for toe and heel hooking. Because of its stretch to fit mesh-and-rubber construction, the Tattoo was designed to be worn tight. To really make the Tattoo work, your foot needs to take up the volume of the shoe and put it under tension.