When the temperature starts to drop during mid to late hunting season, keeping my feet warm is critical in order for me to sit in my tree stand for long periods of time. I have tried many different boots, wearing multiple socks and Toasty Toes in my boots, but none of them have worked for me when it starts to get in the 20's and 30's. If this is also the case for you, then I highly recommend trying the ThermaCELL Heated Insoles! The temperature this morning was 27 degrees with a windchill in the teens. Before I went hunting I replaced my normal boot insoles with the ThermaCELL insoles. They are remote controlled and have a high heat (110 degrees) and medium heat (100 degrees) setting. The great thing about these is once they reach the maximum heat temperature they will temporarily turn themselves off, allowing your feet not to overheat and start sweating, which can in turn make your feet colder. Once the temperature drops, they will turn themselves back on.These are rechargeable and have a battery life of up to 5 hours. My husband bought these for me for Christmas last year and I'm really not sure why I am just now using them! They are definitely worth every penny he spent on them. He also bought some for himself and loves them. I have a size 6 in the heated insoles. I normally wear a 6 1/2 to 7 in normal shoes and this size fits perfectly. The insoles can also be trimmed in order to fit your boot better. Make sure you give these a try. They really work!!