These neck coolers are sitting in the fridge, ready for use. I suggest you google 'neck cooler' and you will find out how to make them. I picked up the dry powder stuff that gels in a rather large bag for $8 in the garden center of Kmart. You could probably make about 50 of these with one bag of the stuff. I did not actually follow any specific pattern, but winged it. We've used them twice so far and they actually work well!