Hi,
Last year I bought a pair of Croc wellies, they are incredibly light, bright red, (but they come in all colours), and are so warm. They also fit really large calves and are antibacterial. They can be washed out completely, left to dry, or dried with a tea towel, and worn again immediately. I absolutely love them. They were only £35.00 too.
Here is a link to them, Hope it helps
Soaplady