The Podium XC is made of Grilamid TR-90, a homopolyamide nylon characterized by an extremely high alternative bending strength, low density, and high resistance to chemical and UV damage.The Hydrophilic rubber ear and nose pieces are for a no-slip fit. The adjustable ear pieces are for a customizable, comfortable fit. The Clarion Mirror lenses are hydrophobic to prevent water spots. Podium XC arms not compatible with Podium and Podium S models