These GEL PACK EZ Heating Pads are made with a non-toxic water based gel pack that has absolutely no scent.  

The 3-panel ones are 12" X 16" and heat up in the microwave and stay warm for over 5 hours, all night long under covers.  To reheat them while they are still warm do it for half the time, then at 30 second intervals until the desired temperature is reached.  

These are also cold packs.  Place them in the freezer for at least 12 hours for cold packs.  

They can be hand washed and air dried.  Made out of a soft, durable fleece, they are warm and cuddly.