Silicone No Designation Adjustable closure Hand Wash Unique silicone pass-though design cord: for sports, fishing, boating, swimming or any activity. Be confident that your sunglasses strap will be secure, all while staying comfortable Made of stretchy silicone: easy to take on and off. Durable, easy to clean and keep clean, adjustable, and comes in a variety of colors Adjustable: Be confident that your sunglasses will be secure all while staying comfortable during any activity you might be enjoying! Pilotfish Premium Silicone Sunglasses Strap Adjustable Glasses Retainer with Unique Passthrough Design – Universal Fit - BAWP2UOLB