The flawless Geox rubber sole is based on an exclusive patent : The combination of the perforated sole and the resistant breathable and waterproof membrane allow for natural temperature regulation, thereby creating the ideal microclimate inside the shoe that keeps feet dry and comfortable for the whole day. The patented Geox systems ensure breathability of the outsole, ensuring the foot enjoys a sensation of wellbeing, the tread with builtin Flexy System offers excellent flexibility, easy to wear, for unparalleled comfort, insole in nontoxic chromefree leather, antibacterial insole, easy to put on and adjustable with a single riptape elasticated lace fastening. Removable insole.