This lace up shoe has a leather and synthetic mesh upper which is water repellent. They have a Chrome free leather lining and a removeable antibacterial Chrome fee leather insole. The sole is the new 'Extra Grip' barefoot sole unit. This sole is designed for more grip than the standard barefoot sole but is the same shape and width. The sole is 5mm thick with a 1mm lug. It is zero-drop, thin and flexible with the same wide toe box we have come to expect from the Froddo Barefoot range