Made of premium thick neoprene, these eyeglass retainers feature reinforced stitching for worry-free durability. Perfect for men and women of any age! These cords are weather resistant, water-proof, and machine washable. Fully adjustable to ensure a tight fit around the head. Fit any head size and shape. Just slide the retainer along the temple to adjust to your size and style. Strap length is 16.5” , expands up to 20”. No need to switch between frames – buy one lanyard for each pair or eye glasses. This eyewear retainer lanyard keeps the glasses on during sport exercises, play, work. Perfect for indoor or outdoor activities such as jogging, dancing, biking, skiing, tennis, basketball, soccer etc.