The fur on the moose is actually hollow. Why is it hollow? It allows the moose to stay warm during the winter and makes the moose more buoyant while swimming. The air is trapped inside the layer of fur and also inside of each individual air, which prevents the moose from losing heat and prevents cold air from reaching its skin. Since each individual hair is hollow, they help the moose become more buoyant. The moose needs to swim in the summer to stay cool and being buoyant really helps the moose stay afloat. Due to this fur, moose are better fitted to live in colder climates than in warm climates. The moose sheds most of its fur and grows a new one each spring. The hairs that are shed are the heavy guard hairs that act as winter coats every year.