Hook-and-loop closure for a secure and adjustable fit. Breathable leather lining and a leather footbed. Durable rubber outsole. Imported. Incredible benefits provided by Primigi's™ uniquely created Sky Effect System™. The Sky Effect System is a special insole that possesses all of the characteristics of a normal Primigi insole as well as some unique features. They are flexible, lightweight, shock-absorbing, breathable and antibacterial.