The invention relates to a bellows hose, which is capable of being used without leakage, and which has a longer length and/or diameter than has been previously achievable. A bellows hose comprises an inner tubular bellows and an outer tubular bellows. An insulation layer is provided between the bellows. An armoured layer is provided around the outer bellows, to improve the insulation further. The hose can have length above 30 m and a diameter above 400 mm. A method of, and apparatus for, making the hose are also described, which involves the use of a non-metallic mandrel.