What is this? We named it as Glasses Strap Retainers or Eyewear Safety Holder Strap. Perfect for those who wear glasses while enjoying more freedom for indoor or outdoor activities in style such as running, fishing, cycling, or playing ball games. What is this for? These glasses straps are designed to keep a tight grip on your glasses or sunglasses when they fall by keeping them secure around your neck, allowing sunglasses to be comfortably hung on your chest, or rest on top of your head when not in use. What are these sport eyeglass straps made of? These holder straps are made of non-toxic quality neoprene, which is soft and stretchy. For what glasses? They are especially designed to fit most of eyeglasses, sunglasses, reading glasses, sport glasses and optical eyewear and spectacles. What??s in the box? – There are 6 colors eyewear straps in the package, so can enjoy more freedom for indoor or outdoor activities in style such as go hiking, running, fishing, cycling, or playing tennis, basketball and other sports activities.