Want a warm and waterproof wetsuit? Then take a look at how the sea otter does it! It’s all down to air-trapping hairs. Ideally, surfers want something that is flexible and easy to wear, which sheds water as quickly as possible when you are out of the sea and will keep you warm when you are in it. With Patrick Aryee. www.bbcworldservice.com/30animals #30Animals