Tifosi mira sunglassestifosis mira sunglasses are optically de centred to eliminate distortion and prevent unwanted magnification the frame is constructed from virtually indestructible grilamid tr 90 plus vented scratch resistant and shatterproof polycarbonate lenses that increase airflow and prevent fogging customised fit prevent slippagethey also feature an adjustable nose pad for a customised fit and the more you sweat the more the hydrophilic rubber nose and ear pads grip to prevent slip