Bollé Swisher Polarized TNS Sunglasses is made with HYDRALON® - Bollé's proprietary, fortified nylon frame material makes the sunglasses comfortable and lightweight and virtually indestructible. And the THERMOGRIP® for strong rubber temples and nose pads. Bollé Sidney TNS Sunglasses has HYDRALON® and THERMOGRIP®. Bollé Vigilante Polarized Sunglasses with 2 Interchangeable Lenses is made with THERMOGRIP®, HYDRALON®, WIRE-CORE TEMPLE TIPS, SPORT OPTICAL SYSTEM (SOS).