TOP QUALITY - MADE TO LAST - Made of premium thick neoprene these eyeglass retainers feature reinforced stitching for worry-free durability. Enjoy the snug fit while working, running, playing sports, or performing any other activity. Perfect for men & women of any age! Weather resistant, water-proof, & can withstand multiple machine washes. These cords are made to last! ADJUSTABLE in LENGTH & FIT MOST GLASSES - Fully adjustable to ensure a tight fit around the head. Fit any head size & shape. Just slide the retainer along the temple to adjust to your size & style. Fit thick & medium temple arms of 4-8 mm thickness, reading & prescription eyeglasses, designer sunglasses for men & women, teens & adults. Strap length is 16.5 (42 cm), expands up to 20.5 (52 cm). Strap width 3/4 inch (2 cm). One size fit all. ULTRA COMFORTABLE & MACHINE WASHABLE - Feel very soft & lightweight on the ears & neck. Keep the glasses on during sport exercises, play, work. Perfect for everyday use, & for indoor or outdoor activities such as jogging, dancing, fishing, biking, skiing, hiking, climbing, tennis, basketball, football, soccer etc. Just wash the glasses cord in the washing machine when it gets dirty & it will be like new! Looking for more products? Here is the solution => https://etsy.me/3gedE3A Eyeglasses Holder, Glasses Chain Sport, Sunglasses Running, Anti Slip Chain, Holder Sports Unisex