Turned out to be wrong size. I ordered a small double but got a double which means my small double mattress has a 6 inch gap. 

Wayfair will refund this but returning it is a hassle as the courier will need it leaving somewhere safe and packaged but wayfair won’t send me packing materials. “Can you put it in bin bags?” Seriously? 

Won’t be using wayfair again as  I don‘t want to be sorting out their problem