Durable Frame The Grilamid TR-90 frame is a light and durable nylon material that resists chemicals and UV damage. Adjustable Nose Pads Davo's adjustable nose pieces are made of hydrophilic rubber that increase grip the more you sweat to prevent slippage. Vented Lenses Vented lenses increase airflow to prevent fogging. Davo's shatterproof, scratch-resistant polycarbonate lenses protect eyes from debris. Adjustable Ear Pieces Made of a comfortable hydrophilic rubber, Davo's ear pieces are adjustable and allow for a custom fit.