I walk dogs for a living, and I was not looking forward to it this season after last summer's miserably hot and muggy weather. I searched all the cooling devices I could find and settled on this one, and I wasn't expecting a miracle, but these little bandanas really surprised me! After a soak in cool water for 30 minutes, one will keep me cool and hydrated all day, and will be good for the next day as well (may not be true for a drier climate). So, one soak will last for two days. When I first put it on, it only felt mildly cool so I thought it couldn't possibly be of much use to me. And it stays mildly cool throughout the day yet keeps me cooled better than I could have imagined. Of course I still sweat some and feel the heat outside but it does not bother me so much with one of these around my neck. Very much worth the more-than-reasonable price.