Fantastic value - 4 packs of products at affordable prices. Use these practical protectors to match your glasses and sunglasses Adjustable – Fully adjustable to ensure a comfortable fit on the head so that the glasses do not fall off or slip off the nose. It can be extended so that your glasses can also be hung on your neck Versatility – Suitable for daily use or outdoor sports, such as fishing, cycling, skiing, hiking, rock climbing, etc. Suitable for most sunglasses, daily glasses and reading glasses. One size fits everyone, making this eyewear accessory the perfect choice for men and women. Fashion - The competitor's straps have only one adjuster, creating an ugly and intrusive tail. These cables use double sliders to eliminate the tail and make the appearance more smooth and refined. Buy ours and live a tailless life Practical - Whether you are annoyed by constantly pushing your sliding glasses onto your nose, or want to ensure that your expensive glasses will not fall or be damaged in the next adventure, these glasses holders are your answer. They are made of tough and wear-resistant silica gel and are durable.