Fit & Design: An XL size of the original Spearo, one of the newest Costa Del Mar(R) styles named for spearfishers - the silent hunters of the sea Embedded spring hinges are self-adjusting for a comfortable and secure fit Vented nose pads keep you cool Keeper-ready temples clip or tie in a keeper to keep your Costas in reach 580P Polycrbonate lenses are lightweight and impact-resistant Polycarbonate and Trivex are the lightest and most durable lenses Technology: Polarized lenses protect against UV rays and filter out unwanted glare C-WALL(R) is a molecular bond which is scratch-resistant Hydrolite(R) nonslip, hypoallergenic rubber nose pads and textured temple grips help keep frames secure Additional Details: Manufacturer Limited Lifetime Warranty