Heavy duty or insulated socks for older, cold feet?
Does anyone have a good source for heavy socks for feet that get cold at night? I'm searching sports, camping and backpacking sources, looking for double knit, insulated, or other heavy duty socks that are washable.
I wear double knits and they're quite warm, but haven't yet found any for my father. The few socks I did find were sold out (online).
These should be loose enough that he can get them on just to wear at night.
If worse comes to worse, I'll buy some fleece and make some, as I think they'd be great, but the good quality fleece is more than my sewing machine can handle so a heavy needle and thimble will probably be required. I've never quite managed to work well with a thimble.
Last year I bought a great electric mattress pad, but the heat generated from beneath the sheets doesn't really warm his feet.
Any suggestions would be appreciated.