Mares Viper Free Diving Mask The product's latest-generation silicones deter condensation Ergonomic buckles with double buttons on the skirt enable the strap to be adjusted precisely Dedicated to the most demanding free divers and spear fishermen Dedicated to the most demanding free divers and spear fishermen The SKIRT has been modeled with meticulous attention to facial ergonomics, making it suitable for all types of physiognomy