Ok, I went with the size 9's. I haven't been able to try them on the ski yet but from sliding one on dry I can tell you that sizing up is definitely the way to go for a wider foot. I'd also like to note that they it fit really well length wise as well (going from an 8 wide), I don't expect to need to use an insole either. Just going off of the dry fit on this boot I think the 8's would have been too small. If I can get them on the ski before the year is up I'll let you know how they are wet.