Hollowfibre Filled Summer / Winter Warm Quilt / Duvet Standard UK Duvet Sizes: Size (Width x Drop): Single: (135 x 200 cm) Double: (200 x 200 cm ) King: (230 x 220 cm) Super King: (260 x 220) ★Colour: White ★ What is Tog? Duvets work by trapping warm air, and the higher the tog rating, the more warmth the duvet will provide. ★ What is Polypropylene? Also known as Corovin, the high tech manufacturing process produces a non-woven hypoallergenic fabric of unparalleled quality and strength. It has an extremely even web pattern and has equal strength in both directions. It is inexpensive and has the same warmth as an identical tog cotton quilt. It is strong, durable and lightweight ★ What is Poly Cotton? A fabric made from a blend of cotton and artificial fibres. Polyester is combined with natural cotton to produce a versatile durable fabric.