Lens: Neox Transitions - Adjusts to all light conditions - Precise visual acuity for distance and depth perception - Enhanced overall visual performance Frame: Tech/Performance Style - Magnesium/Aluminum alloy construction - Lightweight yet highly durable material - Semi-rimless designs equals zero distraction Fit: Med - Large Head Shape - Megol rubber nose and ear tips allows for secure 'non-slip' retention - Hi Tech frame material design