Males hunt all year round if they are able.
If they cannot hunt or live in the open during very bad weather, male polar bears dig into a snowbank or find a hollowed area in the ground. They go into a deep sleep, living off fat reserves in their bodies. Pregnant female polar bears are a different matter. In November and December females go to dens. These dens are deep hollows dug into snow drifts and they are far enough from the shoreline that male bears, still hunting, will not go to them.