Insoles made of alpaca really helped me. They are flimsy so I put them UNDER boot isoles, and I use Superfeet insoles which don't insulate ut the alpaca insole makes up for it. Superfeet do not hold moisture and that may also be helping.Good socks. Darn tough, or smartwool. IF you sweat a lot and don't want to go the antiperspirants route, a polypro or silk sock liner works great.
in a saddle or treestand your feet are hanging in the air. heat loss through convection is real. first in whatever boots you have, ditch the insole. Even in a $500 boot has a $0.25 insole in it. some thing with better insualtion and support will go a long way. It will keep your foot from compressing all of the insulation of your sock and insulate some against heat loss.
And sorry everyone...but the 30's aren't cold....
Oh, and make sure you're dressed the rest of your body appropriately, that will make a difference too, if your core is cold at all, or struggling to keep warm, your body will compensate and ciculation will stay closer to your core.
And food---high calories. No wood in the furnace, no heat.
And as much as I like merino wool, it's a step below alpaca. I'm really impressed with alpaca.
And always, always, always put boots on a boot drier after EVERY hunt. Cut down on as much boot dampness as you can.
Almay antiperspirant on the feet every day too.