I keep a couple of these in the freezer at all times. They come in handy if you get overheated mowing the lawn or if you wake in the night with a hot flash. I've made mine from the sleeves of a t-shirt left over from my last instructable entry (check it out). I've also made it large enought that it can be used for my face or for my neck and shoulders. With 5 minutes, a $1 bag of beans, and a bit of leftover fabric you can be chillin' too!