I just want to say that during home testing and at the WI frozen butt hang n(negative single digits Fahrenheit and wind) I tried using a foam pad underneath my feet and just thin liner socks and I was the toastiest I've ever been. For me, having the foot end of the hammock higher (and warm air goes up), plus the non-compressible insulation of the foam pad, made for the warmest happiest feet I've ever had.
When you insulate your feet in booties you are 100% relying on inside-to-out warmth. When you are bootie-less, you get the benefit of all the warmth inside the sleeping bag. Obviously both approaches will work, but try the foam pad route before thinking you need booties.
-jamie
p.s. that said, I used my down booties for walking around camp!
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