flobeds.com says that their 16" protector is only good for matressess up to 12". I can’t remember where, but another source says that their 16" protector can handle up to a 14" mattress. I just ordered the Brooklyn Bedding Cool Luxe, which is 13", so I wasn’t sure which one to order.
I contacted St Dormeir and they say that their 16" protector will work fine for a 13" mattress.