These frames are all made from super flexible rubberized plastic material to withstand twisting and bending without breaking easily. We highly recommend these types of sunglasses for little ones who are learning to first wear sunglasses for maximum durability. Product Maintenance: 1. Clean the Lens by Water or Wipe Them by the Soft Cleaning Cloth Included Regularly. Do Not Use Any Other Chemicals to Clean the Lens, to Avoid Surface Broken. 2. Do Not Maintain the Sunglasses in Such Bad Environment of High Temperature or Long Time Damp, to Avoid Deformation. Seller Warranty : *30 days Money Back Guarantee *Lifetime Support Guarantee *For any possible defective products, please contact us first, we will offer you a replacement or refund .