Rnow Mens Premium Classic Military Style Full Mirrored Aviator Sunglasses UV400 Protection - Blocks 100% of UVA and UVB rays. UV 400 indicates an eye protection item that has been optimized to prevent eye exposure to both UVA and UVB radiation. One of the biggest differences between UV 400 protected items as compared to other items that protect against the sun's radiation is the fact that UV 400 protected items are capable of blocking light rays as small as 400 nanometers. Polycarbonate Lens - made from a similar material to that of aircraft windshields and are virtually indestructible. Polycarbonate is light and scratch resistant (not scratch proof), offers a high level of optical clarity, and is 50 times more impact resistant than optical glass making for a very strong, distortion free lens. High quality frame - made with only the highest quality materials, these sunglasses were constructed using special design techniques in order to ensure durability and avoid breakage while engaging in sports and recreational activity. Lifetime breakage warranty on frame&lens - Our sunglasses are backed by a lifetime warranty. It does not matter whether you come across an unforeseen obstacle, miscalculate a turn on a trail, whatever the reason, you can have Lifetime Breakage Warranty on Frame & Lens 30 DAY MONEY BACK GUARANTEE-100% satisfaction guaranteed. That is our promise. So, if you're not completely happy with your purchase within the first 30 days, just let us know. We will do whatever it takes to make it right