The Portable Folding Frame screen material is folded so that it can fit into a smaller package to decrease freight cost. If you notice crease lines on the material upon opening the box, there are a couple of things that can be done to alleviate them. The easiest method would be to allow the material to stretch on the frame. Over time, the creases will alleviate to a minimal.If after a few days you do not see any improvement, the second method in alleviating them would be the use of a hairdryer. Set the dryer on medium heat and blow on the material from its back side from about 3 feet away, concentrating only on the crease lines. Do not apply excessive heat as this will cause for the material to deform. You may need to repeat this process for a couple of consecutive days depending on the severity of the creases.Material when first unpackagedMaterial when fully tensioned on frame