Rain boots are waterproof but moisture often builds up inside. This is OK, feet sweat, or condensation appears due to temperature differences. The boots must be dried every time.

First of all, pull out insoles and/or remove boot socks and let them dry separately from the boots. You can do it on a radiator or heater for quick drying.

Put the paper or old newspapers inside the rain boots and rest them to dry for one night.

Do not use a radiator, heater, or electric dryer, the boots can be deformed.

And then your rain boots are prepared for a walk again!