Originally Posted by
WhyFi
Since it's getting rather chilly, I decided that it was time to buy an insulated water bottle (Camelbak Podium Chill) and I also picked up some chemical toe warmers to try out.
Chemical toe warmers works well. Keep in mind though that they require oxygen to generate heat so if your shoes /shoe covers are well insulated, you'll need to take them out after a while to re-oxygen them. They last for several hours so if they have not exhausted all their heat generation, simply put them in an airtight ziplock bag. Without air, they'll quickly stop generating heat and will reheat once taken out.