When it comes to insulation, nature knows best. Unlike the rigid structure of feathers which offer little insulation, down is found on the undercoat beneath birds’ feathers, mainly on the chest and belly. It consists of light, fluffy filaments that grow from a central quill point. As there’s no quill shaft, the structure is naturally soft. It effectively traps tiny pockets of air between the filaments, creating thousands of insulation pockets that simultaneously allow moisture to escape. This superior insulation is what keeps your body from losing heat in a way that is naturally more effective than feathers or synthetic materials.