Sunglass straps can be made of different materials, types and colors. Ommon types include linx, terra, floater and leather cords depending on the needs of the person. For usability, sunglass straps offer comfort and ergonomics. They prevent headaches among wearers, protects the eyes from the harmful rays of the sun and aids people during sports, games and strenuous activities.
Resources: http://www.hangers.es/