"We are now finding that the old-fashioned storms were as good or better insulators than the double-paned windows," he said.

The airtight glass walls have turned out to be better insulators than thought.

That makes it a better insulator, more able to keep their body heat inside.

The combination of trapped air and feathers is a much better insulator that feathers alone.

The wood underneath was a better insulator.

Moist soil is a better insulator for the roots than is dry soil because the water has to freeze first.

The two resulting spaces are filled with argon gas, which is a better insulator than a partial vacuum.

All we need do Is make the shell a better insulator: foam.

All we need do is make the shell a better insulator: foam the material, for instance.

A handful of specialty window makers have been experimenting with krypton, which is more expensive but an even better insulator.