The super gators (insulated) I purchased from Mountain Tools seem to work quite well. Wearing my boots in the super gators on my feet make them feel like they are on fire. Perfect!
This is something that has been troublesome over the years because very few manufactures, if it all, make super gators anymore. Regular gaiters are great for protection but they don’t add any real warmth. When it is -45 and your toes are turning black, you’ll think of anything to try and keep them alive.