Extra-large eye coverage, crystal-clear vision, total Polarized protection and Photochromic options are the hallmarks of the CHAMBER. The frame is constructed of tough Grilamid TR90 while the TLT Techlite Glass lenses provide security for harmful UV A/B/C rays. All together this sunglass is great choice for those with larger face fits seeking total performance. As always the Chamber is backed by Smith's lifetime warranty.