ZoE has a gel cooling mat. Her mat is 19.5"L x 15.5"W. It's the perfect size for her to lay on. I put it in my cooler when we go out on a hot summer day to festivals/fairs and then put it in her stroller for her to lay on.
It's cool to the the touch, but not cold.
I ordered it from the Foster's & Smith catalog...it's a size medium.
Cooling Dog Beds: Gel Pet Mat Comfort Cooling Mat