FLAME RETARDANT & WATERPROOF (PU) DUVETS Product Details: Premium Polyurethane Coated Outer Cover 100% Polyester FR treated Hollowfibre Filling Anti-Allergenic Highly Durable Soft feel, Low Noise Wipe Clean only Our flame retardant, PU duvets are manufactured in UK using FR Polyurethane synthetic fabric, which is tested to ensure it complies with British Standard (BS) 7175 1989 Section 3.Polyurethane is a polymer composed of organic units joined by carbamate links.While most polyurethanes are thermosetting polymers that do not melt when heated, Our duvets and other FR bedding products, be it cotton or polyester, gain their flame-retardant properties through a quality controlled Chemical process.