Bliz designed the Velo XT Small Face Sunglasses for speedy endeavors like cycling, trail running, and cross country skiing. Bliz included two extra pairs of lenses that you can quickly switch out at a moment's notice. These Unbreakable Polycarbonate lenses are ten times more impact resistant than standard plastic or glass lenses, and the grilamid TR90 frame is flexible, superlight, and surprisingly strong. There are adjustable nose and temple grips for a secure fit, and the attached strap adds security. Proposition 65 Warning for California Consumers: This product contains chemicals known to the State of California to cause cancer andor birth defects or other reproductive harm.