ver the centuries, the Japanese have enjoyed slipping into bed on cold winter nights with a simple warming device called a yutanpo.

Today, we have electric blankets and bedroom heating systems,

but many people still like the yutanpo—it's a gentle way to stay warm, and environmentally friendly as well.
The yutanpo is a snap to use. Take enough heated water (60 to 70 degrees Celsius) to fill a yutanpo about two-thirds full.

Wrap it in a hello kitty cover so it won't come in contact with the skin, then put it between the sheets.

You'll be warm and cozy all night,

and the water will still be warm in the morning, ready to use to wash your face or the breakfast dishes.