I find Asolo sizes to run a little bit small. I tend towards one size larger than usual. Anyway, these boots are amazingly good in the wet, on rocks, in streams, in the mud, and back up onto the rocks. They don't breath as well as other, lighter, boots, so I do not wear them in the summer. For Spring and Fall it's hard to beat them. Asolo is well known for good customer service if you have a real problem with one of their boots. They replaced a pair of mine (not these) that had, I thought, prematurely worn out.