I have to leave the cover about halfway unzipped, but then the pillow wants to stick out of that part, somewhat defeating the purpose of the cover. If you want these for casual wear than get a half or whole size up if youre one of those people who likes their shoes loose. and occasionally I have to go up to a size 7 B. This was after being able to finally make it align to start charging at all. I have bunions that make it difficult to fit into regular width shoes/sandals and the adjustable straps (all 3 of them, by the way) accommodate this just fine. I have wide feet with a huge large toe bone, so the soft woven fabric on these is wonderful and stretches just a tad bit to conform to my foot. They should let people know what size jars will fit. The fabric is a light, comfy jersey material. 5 womens. This helps me none due to one being too large and the other way too small.