I have flows and they're mostly for cold weather wear. I've been wearing them since it turned cold. They're not fantastic for staying warm but they're liveable. I'd rather have cold feet for trips to and from the car, than to wear boots at work all day. One thing I will say is, they'll make your feet sweat, that's for sure. They also don't keep water out if that's what you're looking for.
I'd recommend the KSO for water wear. I use them when I'm walking through the woods and creek. Also not waterproof, but they keep most bits of stuff out.