Yes, there is a bracelet that does both heating and cooling effects: https://embrlabs.com/ https://embrlabs.com/ Maybe it's a placebo but I wash my hands with

Yes, there is a bracelet that does both heating and cooling effects: https://embrlabs.com/ https://embrlabs.com/ Maybe it's a placebo but I wash my hands with cold water in the summer and I believe it makes a small, but noticeable, difference in cooling me.