The bear houses and wooden cabins the bears can use to hibernate besides their own dens, aren’t heated. At our sanctuaries, we spread straw and saw dust layers on the ground so that the bears don’t lay on the concrete floor. The dens our bears dig themselves, don’t get extra cushion from us. If needed, the bears cushion it on their own. They use leaves or moss for it. The burrows are just big enough for them to turn around in. This way, the body temperature cannot escape so quickly and helps to keep the cave temperate. Inside the den, it is therefore always warmer and drier than outside, mainly because of the wind shield. Especially healthy and well-fed bears are very little sensitive to cold temperatures.