Upper made from ultra lightweight, supple, synthetic leather. Soft and durable polyurethane (PU) molded heel for maximum durability and cushioning. Ultra low profile sole with a layered, sandwich, construction. Inner lining is made with 2 mm EVA foam for comfort. Pressed internal midsole with glued steel shank for added comfort and support, coupled with an ultra-thin rubber outsole for greater flexibility and reduced wieght. The outsole is oil resistant. Alpinestars exclusive speed lace closure means quick and precise fitting. The PR Nylon laces run through PU eyelets and are secured with a self-locking clasp and the end of the laces can be secured either with the Velcro tab on the heel, or within a loop on the tongue.