Want to try a new mask, but unsure if you'll like it? Our 30 Day Guarantee eliminates that stress. If you are not 100% satisfied with your CPAP Mask purchase, you may exchange it or you may request a full refund of the product's purchase price (less the original shipping costs) within 30 days of the delivery date. The customer is responsible for return shipping costs and only available. The 30 Day Mask Guarantee within the continental United States. We reserve the right to refuse to honor the 30 Day Mask Guarantee to anyone we judge to be abusing it.