This magical photochromic lens is based on the intensity of sunlight and ultraviolet light that darken the light gray lens. Moreover, these glasses protect the eyes without interfering with your color perception. Also trendy rectangular design, always suit your daily dressing demand These sunglasses are superior to previous sunglasses in three ways when moving indoors or outdoors, the lenses automatically adapt to reduced light conditions. Second, polarized lenses reduce glare and glare. Meanwhile, 100% UV protection layers against harmful UVA/UVB rays OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.