When the ISOfrane dive strap debuted in the 1960's, it quite literally changed the shape of diving - or at least the shape of dive straps! Before, the ISOfrane dive straps were usually made from rubber. They were sticky, uncomfortable and would often blister and crack in extreme conditions. These straps were even harder on the divers wearing them. Without ventilation, the skin doesn’t breath. The ISOfrane strap changed all of that.