It's unique wave beam construction eliminates uncomfortable surface. First, make sure that the airbed is leaking. Stretching is a natural characteristic of new vinyl and the first few times you use the mattress, some stretching will occur suggesting that the mattress is losing air. It is simply stretching under your body weight and this is normal for the first few uses. To check the mattress for leaks, first make sure the valves are secure, replace it if necessary. You can also put liquid soap and water in a squirt bottle and spray on seams. If there is a leak it will bubble. (Laundry detergent and dishwasher detergent will not work; they do not have the "bubbling" effect) After you find the leak, clean and dry the leaking area, remove the flocking with fine sand paper or an emery board, then apply the repair patch that comes with your airbed