Functional Glasses, DUCO is No.1-Slogan Duco focus on a wide variety of functional glasses from night vision glasses,prescription glasses, sports cycling glasses,anti blue ray radiation computer glasses to UV400 protection polarized sunglasses. We endeavor to provide quality products at prices which provide value to our customers. Polarized Sunglasses Polarized sunglasses have a filter that works to prevent the glare from reflecting on flat surfaces (water, snow, road pavement) which interfere with vision. They can be highly useful for sports, driving, and fishing by helping the participant in these activities to see more clearly. They provide premium protection against the sun's harmful rays. Why are polarized sunglasses better than normal sunglasses? Polarized sunglasses can selectively eliminate the reflection from light coming from above the water surface while normal sunglasses don't have that function. Lifetime Warranty 100% Satisfaction Guarantee. Please contact us when your item need Warranty. How do I contact DUCO? Go to the product listing on Amazon.com and click on 'Duco Glasses Co., Ltd.'hyperlink seller name, then find the 'Contact the seller' button or click on' Ask a question' hyperlink. Or Go to your order list, and click on 'Contact Seller'. About Reviews Thanks for all buyer's reviews and we have summarized review content and made improvement. 1-We have improve nose pad bigger so that it will not drop off anymore; 2-We added more coating on lens to ensure anti scrath; 3-You can bend the nose pad metal part and ear sock end to fit your size; 4-We do provide lifetime warranty,so please contact us if you need. More Choice Visit www.amazon.com/shops/ducoglasses for more information on DUCO glasses products.