Demon Nature with lens category 3 is a pair of hiking goggles with impact-resistant polycarbonate mirrored lenses for optimal protection of your eyes and an ultra-light, wrap-around frame for maximum protection from the elements: light, leaves and branches. These hiking glasses are made with the same technologies used in high-altitude lenses, but differ in the type of lens (category 3).This particular lens differs from category 4 in that it is lighter in colour, due to the reduced UV and light density compared to high mountain and glacier areas. The TR90 frame is a special composition of nylon and carbon fibre that makes the glasses 20% lighter than conventional materials and more resistant to accidental impacts and mechanical stress. The major advantage is a longer service life. The frame is also on the underside of the lens, offering greater safety for athletes as, in the event of heavy impacts, there is no direct contact between the face and the lens, thus reducing the risk of injury. DMIRROR lenses are made of premium polycarbonate that filters out harmful UV rays. In addition to the considerable weight reduction compared to common materials, they are a guarantee in terms of safety. The end of the poles allows the attachment of an adjustable elastic band (included) to increase resistance to vibrations or sudden movements. Significantly improving comfort and adaptation to any type of face. A robust case is included to protect the DEMON glasses from scratches. The measurements of the NATURE model are: Width: 140mm; Height: 50mm Rod Length: 134mm; Lens Base: 8 Demon Nature mountain sunglasses