Just took it out of the box and put it on my son's bed. I think this is a manufacturing defect, only one of the corners is assembled and sewn as shown in the photo. This created a bottleneck in the corner and it ripped when trying to put it on the mattress. I ordered a replacement so I hope it was just an accident. TO UPDATE. The first must have just been an accident. My replacement is great. Has been washed many times and is still holding up!
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