It is a nice fit for her.
Just soak it in cold water, wring it out, and fasten around your dog. Evaporative cooling (like an actual swamp cooler) exchanges the dog's heat with the coolness of the stored water in the coat to keep them comfortable, cool, and ready to run that extra mile. Or in our case handle the car drive without the AC full time.
No matter what position she is in. It worked well, I just had to add more water after about 3 hours into our drive from Willits to Danville. Tomorrow will be a major test.
Peace!
C & R