Make sure your sunglasses are always safely on with the Costa Del Mar(R) C-Mono Sunglasses Retainer. Made with high tenacity and monofilament, this Costa product defines durability and can take on the trail or go with you out on the water. A sleek build and a lightweight means you won't even feel the C-Mono while the flat, low profile temple attachments ensure your shades are secure with every wear. FEATURES: High tenacity and monofilament Sleek build and lightweight Flat, low profile temple attachments California Proposition 65