Material:Plastic Color:Black Size:Approx. 14.2cm*14.2cm Great for hiking, rock climbing, tourism and so on Polarization function is good, clear vision According to ergonomic design, the glasses legs is non-slip and flexible, make you more comfortable to wear The prisms allow climber to view upwards without having to crane their neck backwards With these glasses, climbers are able to see the road on the head while looking straight ahead Adopt reflective principle, need not sit up, lie on the bed can also enjoy watching TV or books, more comfortable and convenient daily life Ergonomic design make you comfortable to wear Non-slip and flexible, not easy to fall when you walk Adopt reflective principal, brings much conveniences in daily life Great for hiking, rock climbing, tourism, and so on Package Included:1 x Prism Glasses Note: 1.Please allow 1-3cm error due to manual measurement. 2.Due to different monitor and camera lights may cause slight color differences, mainly in kind of all colors.