Rubber is a poor conductor of heat. A suit of rubber can trap water (or air) around the skin and keep that water at the same temperature. This insulates the trapped water (or air) so that the skin feels warm. Rubber is a good insulator.
surfing under the sun in warm climates or using a rubber suit in cold waters
wear merino wool socks, and 1200 gram thinsulate rubber boots!
Leather, Rubber, Goose Feather's (In Duvets), Shearling, Wool, Flannel and Polar Fleece
I usually microwave an ice pack for 30 seconds then rubber band it around the thermos.
The rubber band becomes warm because of friction. if you ever listen to school you would have known that.
whales keep warm by their blubber! good question
The fur on their bodies keep them warm.
They don't need to keep warm, they have a double coat so they stay warm.
Keep them out of the sun
They urinate on their feet to keep warm.
heat keep us warm :)