From the MANUFACTURER:

       This cool comfortable sandal boasts an outdoor-style design and will be a trusted ally for those leisure pursuits and fun summer days spent moving around easily and in total freedom. Enhanced with Italian-patented Geox perforations, the sole allows for the utmost breathability and delivers constant long-lasting comfort levels. The sturdy rubber sole is pliant and provides an excellent grip.
The classic 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 a microclimate inside the shoe that keeps feet dry and comfortable for the whole day.