It has a double riptape fastening, meaning it is adjustable and easy to put on.The tread has been endowed with our Softly Cushioned System technology which soaks up knocks, bumps and vibrations coming up from the ground, while the Flexy System ensures outstanding pliancy every step of the way. The insole and interior lining come in chrome-free non-toxic leather, keeping the foot feeling dry at all times. The sole has a special slim design which boosts pliancy. Moreover, the sole has been made according to our exclusive Geox patent which ensures the utmost breathability as well as providing a feeling of well-being all day long.