Flying Eyes Hawk sunglasses are designed to be amazingly comfortable under a helmet or aviation-style headset. These ComfortPro sunglasses are made of a flexible polymer and include interchangeable temples. Their 1mm thin temples and their flexibility mean that you will not feel them while wearing a helmet or aviation-style headset. And no more noise leaks while wearing a headset either! Each seat of Hawk ComfortPro frames includes three sets of temple options. Standard temples for everyday use, micro-thin temples for use under a helmet or headset and a strap/cinch system for ultimate comfort under an aviation-style headset. They also offer precision manufactured polycarbonate lenses that offer uncompromised clarity and shatter resistance. Options include gradient gray and solid gray tints. Each set of Flying Eyes eyewear comes with its own protective case and a soft, microfiber cleaning cloth/bag. And like all Flying Eyes eyewear, they are prescription compatible.