I honestly only purchased this neck gaiter on a whim, not really expecting it to be that effective but just hoping it would do a little something on the hotter days. My dog already has a cooling coat (not Ruffwear) that usually stays wet for about 30 minutes, so it sometimes doesn't last for our whole walks, unfortunately, but it is what it is. I figured this gaiter would stay wet and cool for the same amount of time because it feels just as lightweight. What I was not expecting was for it to stay wet and cool for FIVE HOURS! And maybe even longer - I stopped counting at five. It was great! It was nice and cold that entire time, in spite of the warm sun, and even though it only covers her neck, it seems to be just the ticket to take the edge off the heat for her. Better yet, she can wear it even while wearing her service dog gear (she is a medical alert + response & mobility assistance dog,) and it doesn't make her smell like wet dog. I am surprisingly glad I got this! I may try out the swamp cooler as well, if it's anywhere near as effective as this little thing!