The technically advanced micro fibre of the new Sleep Skin is designed to be used ?next to skin?. Its remarkable thermal properties work by trapping warm air next to the skin. Remaining highly breathable, sweat is "wicked away" allowing ideal levels of body heat to be maintained. SUPPLIED IN TWO PIECES: A pull over hooded top with a zip up neck and detachable, adjustable hood. Trousers with elasticated waist and ankles.