The new Portable Performance Sole with Arctic Grip technology has been specially developed by Vibram for use on icy surfaces. The fold-up soles easily attach to any kind of footwear using a simple system of adjustable shock cord fasteners. The Arctic Grip studs have been designed to ensure that the sole is in contact with icy surfaces, increasing grip especially on wet ice. The practical folding technology allows the new Portable Performance Sole to be deployed at lightning speed to be attached to the shoe. When folded, the new sole can be transported in the waterproof storage bag.