Purchased this cooling scarf because I care for my elderly mother and have to keep the house warm for her. I get hot doing basic work around the house. I didn't like the look of the necklace, as the cooling beads are very large. That is hidden well in the scarf. Plus, you can use the extra material on the scarf to wrap the scarf like a belt, put it on your head like a headband, basically secure it wherever you are hot! The beads remove easily from the scarf so that the scarf can be laundered. The scarf is a stretchy jersey like material. I would prefer that the beads not be so large, but I suspect they are so to ensure longer cooling times. I've never worn the scarf for longer than it is cool. Insert claims that it is "cool for hours" and I believe that is accurate. I have worn it for an hour and it was still cool when I removed it.I also purchased another of these scarves for my sister who is overweight and frequently gets too hot. She, too, loves it!