The LaSportiva Python Climbing slipper was designed to satisfy the needs of climbers who climb in the gym, craig, and in competitions. The shoe has sticky rubber over the toes and in the heel for hooking. The tension strap is perfect for people with low volume feet who cant get a good fit in a slipper. The unlined construction is super sensitive for body tension moves when your feet are barely on the wall.Lining - none.Midsole - 0.8mm LaspoFlex.Sole - 3.5mm Vibram XS Grip 2..