I stopped buying insulated boots years ago. Most don't allow your feet to breathe, your feet sweat walking to the stand and freeze. I've worn un-insulated boots along with very good wool socks down to 0 and not gotten cold feet. If in arctic conditions well below 0 then I can see it. Especially for snow machine riding or ice fishing where you're not active.
The key to warm feet is to keep your body's core warm. That is the brain and internal organs. Your body uses the hands and feet to regulate body temp. If your core gets cold your body reduces the blood supply to the feet and hands first in order to keep more warm blood flowing to the core. No amount of insulation on the feet will matter if your core is cold. If the core is warm, none is needed.
If your core is warm, the body increases blood flow to the feet and hands in order to cool down the core. If you bundle up too much walking in the feet sweat.
There have been several good tips, but to add some others.
* Most important, a hat, cap, or whatever it takes to keep the head and neck warm.
*Anti-perspirant on the feet will prevent sweating. It really works.
*Change socks after you get on stand.
* I don't wear long underware bottoms, too hot walking in, in fact I'll often start out in just a T-shirt in weather below freezing if I have to walk very far in mountains. But I do carry a day pack with other clothes. Goose down is the warmest and lighest to carry, but there are some very good alternatives today.
* I often carry a pair of lightly insulated warm-up pants that will slide over my pants after I get to the stand to keep legs warm after sitting. In very cold weather I carry a lightweight sleeping bag. They make some that weigh about 2 lbs and compress to the size of a loaf of bread. Getting inside along with everything else is toasty. Not recommended in most tree stands though.
* EAT, EAT. When I start getting a little chilled I eat just a little. It increases the metabolism and will keep you warm. Around Halloween I buy several bags of the bite size Snickers candy bars. It only takes 2 bites to eat one and it warms me up for about 30 minutes.