CostaBayside 580P Polarized Sunglasses Whether you're on the boat, dock, or back deck, the rounded eye shape of Costa's medium Bayside frame will keep your eyes as relaxed as your body. This softer lifestyle frame is stil made to perform with ventilation ports, Hydrolite nose and temple pads, and pin hinges. The bio-resin material is durable and kinder to our environment for a future of days fishing on the bay.