ive heard for winter boots that at least f 400 grams of insulation is needed to keep your feet warm. i have a pair of mossy oak boots that is probably the best pair iv'e ever owned. your wasting your money if you don't get anything waterproof, and leather is a good choice to. be sure that when you purchase the boots you are wearing the same socks you will be hunting with. it can make a huge differencee in fit.