The Chums Switchback Silicone Retainer is a lightweight, one-piece molded eyewear strap designed to keep your glasses secure during active, outdoor use. Priced around $10, it is made of stretchy, hydrophobic silicone that resists UV rays, corrosion, sweat, and dirt. Key Features Two-Port End Design: The temple ends feature dual attachment ports that fit virtually all frames; the top port is sized for wire and thin frames, while the bottom port accommodates standard and large-framed glasses. Versatile Fit: Can be attached "right side up" for a close-to-the-neck fit, or "upside down" for a floating, halo effect. Comfortable & Lightweight: Weighs just 0.5 ounces and won't cause skin irritation or weigh down your glasses. Durable: Fully waterproof, non-absorbent, and easy to wipe clean. Dimensions: Total length is 17.5" with a usable length of 15.5"