Keep your Costa Del Mar sunglasses secure and stylish with the Bowline Silicone Retainer. These leashes are designed specifically for Compatibility with Costa Del Mar glasses but work with most sunglasses. This lightweight and adjustable holder is an excellent accessory for those who value both form and function in their eyewear essentials. Crafted with a strong silicone cord, the Bowline Retainer offers a snug fit that prevents slippage while allowing for easy adjustment. The are a nice insurance too, no more setting them down and leaving them at the bar or restaurant!