The CURV Z by Lane Sunglasses Inc. offers all the benefits you want from true riding/skydiving glasses. The CURV Z model consists of a light weight plastic frame designed to fit comfortably and snug just like riding/skydiving glasses should. A soft airy foam forms an airtight seal around the eye sockets and protects them from wind and dust to maintain the ultimate in riding comfort. The combination of frame design and the soft foam are second to none.