I've owned/ have owned both Goosefeet down socks and ZP's possum down socks. For dedicated sleeping socks, for me, since I've had frost nipped toes and fingers so get cold feet and hands rather easily and it can be difficult to warm the digits back up I prefer the Goosefeet down socks. IMO they down socks are definitely warmer then the possum down socks.
While Fox is right no one wants to or should put dry socks on over wet feet when I do have wet feet before I put the Goosefeet down socks or ZP's possum down socks on I care to my feet for maceration, hot spots, and drying them off first.
There are knock off down socks much less expensive because, for one they use cheaper duck down in their construction rather than the higher grade grey or Hungarian Goode down ZP and others use.
https://www.amazon.com/gp/product/B0...odtag154483-20
Montane also makes their Fireball Footie down booties out of Primaloft Gold Eco clocking in at 3.3 oz, sold at REI(so if you have some REI rebate do re mi?), and CAN be worn around camp based on seeing their sole. $45 I've never owned or demoed the Montanes. Just looked at a pr in REI.
https://www.rei.com/product/137915/m...e-camp-booties
I really do love my Goosefeet down booties. I bought them from BEN before starting GF proper when he was selling them on the side through BPL. I've had mine with no holes and no down loss for something like 10 yrs. I dont walk around in them although I have the over booties that allow this they are still unused brand new. If you want them Saltysack say the word. I'd like someone to use them. These are the WP over booties I can send ya.
https://goosefeetgear.com/products/w...-over-booties/