Not snow-shoeing, but I had some wading through 1-2' snow over the last week.
Only issue I see with them, without the snowshoes, is that snow gets under the mesh top around the toes.
I had a huge ice bubble in the outer toe area for days, drove me crazy.
Agree with previous comments, I used these just fine with walmart nylon liner sock and light merino hikers.
edit: From what I've seen, Inov8 sizing is VERY inconsistent. I resold a pair of 390's I bought on the forums that were too narrow. Then I found a store that sells closeouts that had like 5 pairs of the same size. I tried on each pair, each pair had a noticeably different fit.