That has to have been Lisa....

Chemical toe warmers work great with booties if you put them between the shoe and the bootie, instead of inside your shoe. They get enough 02 there, they still warm your toes and you don't have to cram them inside your shoe. If they aren't the adhesive kind, you might need to use a little tape to hold them on....

Hand warmers do expire. We had a big box of them from Costco. After about 2 years (I think, maybe it was only one) a lot of them got hard and wouldn't activate when opened. Seems the more "fresh" they are the better they work.