GUNNAR guarantees the quality and performance of their eyewear. If you do not notice a reduction in eye strain and an improvement in clarity, focus, and visual performance, send them back for a refund of the purchase price. Eligible returns must be made from an authorized GUNNAR retailer. Non-Rx returns will be accepted within 30-days of the purchase date for your money back. GUNNAR is not responsible for shipping costs on returns or exchanges.