✔ SWISS TECHNOLOGY - Swiss TR90 plastic technology allows the glasses legs to bend and return to their normal shape. ✔ LIGHTWEIGHT & ANTI-SLIP- Only 16g for a comfortable 'barely there' feel and anti-slip legs ensure they stay in place ✔ SCRATCH RESISTANT - avoid annoying lens scratches from every day wear and tear ✔ IMPACT RESISTANT - Flexible frames mean Proflex glasses are stronger than most other brands of reading glasses ✔ 100% GUARANTEE - No questions asked replacement or refund if you are not happy for any reason. We are a small family ran UK business, contact us via amazon before leaving feedback so we can resolve any issues.