I wrote and asked about the size, they told me that 9 inches would fit my size BUT they don't say that the zipper is small at the top or bottom side, not the longer side, and it does bodily harm and damage to me just trying to put it on. still trying. I would post a photo if I wanted to go through it. It may have shrunk and I can't comment on durability as I haven't worn it yet. The main downside is the bottom zip, but perhaps the side zip wasn't as effective for dust mites.
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