KAVU Revel An important feature of the Revel sunglasses is that the lenses are set off the front of the frame to allow maximum ventilation for hard-core activites. The Revel is excellent for paddling, as it fits under helmets and does not fog up. The frame and lens material is LYX nylong and feture Kavu active hinges. The silicone nose and ear pads maintain grip even when wet and sweaty.