My hands usually contract when heated. Why are my hands the same thick all year round?

The wrist will be thicker in summer and thinner in cold weather. It's true. If you love watches, it will be easy to find this phenomenon, especially the metal strap. If the strap is adjusted in a place with low ambient temperature, it will feel a little tight in a place with high temperature for a while. If it's in winter, you'll find that just the right strap will become very loose.