Here's a look at the inside and outside. I would have used my surger but it was in my sleeping sons room at the time. I made a stitch and then zig-zagged the edges. I probably didn't need to zig-zag it, because fleece doesn't fray.
Works like a charm!
For added protection and warmth, I've put my ankle socks over the tops of these mittens. That way the socks get wet leaving the inside mittens mostly dry (I do have to brush the snow off right away to keep it from melting to the inside).