How is the sizing on that pair. I only have a pair of Viberg Side Zips in 8.5 that fit well and a pair of slippers in 7. So Viberg sizing confuses me, I know the slippers are weird. But is the side zip consistent with boot fit?That was my first pair of vibergs and I learned what my actual size was the hard way. I still wore the **** out of them hoping they would eventually fit hahahaha