I agree with the hat. I quit carrying my booties - they just did not help much, and were too much weight. If you really want to heat your feet - like, say its gonna be really cold - wear produce bags. Just get some free produce bags at Walmart or the grocery, put the produce bag on when you get to camp or before you go to bed. Put one thick wool sock over the produce bag. Try it - its free. I saw a post about this a year ago and started doing it. I even hike with a produce bag under my hiking sock sometimes, especially if its raining. Its the cheapest, most comfortable VBL sock that I have ever heard of.