Xiaomi Turok Steinhardt TS Brand Nylon Polarized Stainless Sun Lenses 18g Edgeless 100% UV-Proof for Outdoor Travel Description 100% UV-proof – Nylon polarized lens Adopted shatterproof polyamide nylon lenses, which are ideally suited for natural horn frames due to their lightweight comfort and flexibility. Nylon lenses also offer high UV protection rating (Almost 100%), superior light reflective index, and excellent resistance to heat and chemicals. Classic style – Aviator sunglasses The design of classic Aviator style, a perfect decoration suit for different of face, making your face looks more beautiful, stylish and elegant. Exquisite Design – Edgeless and Lightweight Using advanced craftwork with seamless technology, create a edgeless spectacular frame for more stylish and elegant. Made by 304H stainless steel, which contains 25% the level of ordinary stainless steel, providing a stable and lightweight spectacle frames. Note: TS nylon polarized lenses glasses made by Turok Steinhardt company, which belongs to Xiaomi corporation. About the No Doarder design: It’s a special skill to make the frame hide in the glass lens, the Visual effect is no boarder, it’s hidden in fact.