Demon Eiger Photochromic 2-4 Lenses sunglasses mountaineering

Demon Eiger Photochromic 2-4 Lenses are sunglasses suitable for all outdoor activities, from glaciers to hiking.
The photochromic 2-4 lenses are extraordinary lenses with a light gray base tint that can reach class 4 during peak activity. The initial light gray allows for proper visibility in shaded areas and low light, and under optimal lighting conditions and UV exposure, it can reach class 4, typically used in mountaineering.
The photochromic 2-4 lens, subjected to UV radiation and general sunlight, initiates a reversible chemical reaction that darkens the lens surface up to class 4 (if necessary). When exposure to light and UV rays ceases, the lens gradually returns to its original color state.

This special photochromic lens has been designed to create a variable lens for hikers and mountaineers, adapting to every light variation along their route. Whether in a wooded area or on a shaded slope, the lens is designed to lighten and darken quickly, allowing the athlete a constant and perfect view.

The initial tint of the lens is a subtle smoke shade that does not force the athlete to remove the sunglasses in low-light conditions. Similarly, class 2 prevents glare when exiting shaded areas. Achieving class 4 at peak effort is influenced by the intensity of UV rays and light.

It is important to understand that this particular lens is designed to reach class 4 only when necessary, thus avoiding overly dark vision of the path.

The frame is made of TR90, a special composition of nylon and carbon fiber used by DEMON for creating all models of glasses for mountain, trekking, and mountaineering. It is an allergen-free composition and can be used in extreme conditions even long-term without causing annoying skin irritations.
The uniqueness of TR90 is its extraordinary flexibility and hardness against accidental impacts and mechanical drag, and it is also 20% lighter than structures made with classic materials. Normally, a frame built with this particular composition weighs between 20 and 45 grams depending on the thickness of the frame.

The non-slip Megol portions are made of soft, ultra-lightweight, and hypoallergenic material, making weight the main feature. These parts are designed to enhance the comfort of the glasses and prevent any annoying downward movement on the nose, especially when maximum stability of the glasses on the face is required.

The sweat-absorbing sponge for mountain glasses is high-density and made of hypoallergenic material. A must for mountaineers, it serves multiple functions. Sweat Protection: it prevents sweat droplets from contacting the eyes during intense effort. Air and projection protection: it prevents air or any projections (e.g., dust) from contacting the eyes. Light protection: it prevents side light rays from reaching the eyes, hindering proper vision. The sweat-absorbing sponge is removable at will, used by the mountaineer or hiker based on their needs.

Elastic cord: for the Eiger model, an included removable elastic strap is made of flexible material to offer greater comfort and security, even in extreme conditions and on rough terrain. Additionally, it ensures a firmer and tighter grip on the head, protecting the eyes from: air, cold, dust, and various debris that the athlete may encounter on their path.
The mountain glasses with photochromic lenses for mountaineering and hiking guarantee maximum performance without any compromises.

The measurements of the Eiger glasses are:
Width - 140mm;
Height - 50mm;
Temple Length - 125mm;
Lens Base - 8.