The Tifosi Logic is constructed of Grilamid TR-80, a homopolyamide nylon that features a high bending tolerance, low density, and high resistance to UV damage. For a secure and comfortable fit the Logic frame uses hydrophilic rubber ear and nosepieces to prevent slip, along with adjustable ear and nosepieces. The Logic is available in a wide range of frame colors and lens options. Price: $70 More: tifosioptics.com