Curli air-mesh vest dog harness

I've never seen or heard of those vests. Edit: I just looked them up. THey might be cooler than another type of that kind of harness, since the mesh fabric should breathe better than solid fabric. Personally, I don't see how they would really help cool the dog.

I have used Outward Hound Cooling Bandanas. They help. You soak it in water and then put it on the dog.