Tifosi Slope Interchangeable Sunglasses are all about performance. Interchangeable lenses allow you to adapt to changing light conditions without carrying around three pairs of sunglasses, and the tough, impact-resistant nylon frames won"t shatter if the game gets rough.Interchangeable lenses (included) so you can customize your sunglasses to suit the lighting conditionsGrilamid TR-90 is lightweight, resilient, and resistant to chemical and ultraviolet damageHydrophilic ear and nose pads grip better when you sweatSmoke lens color helps on clear blue days, AC Red works for sunny-to-cloudy skies, and clear works well in low-light conditions