QUALITY POLYCOTTON: The cover on this duvet is made from a soft polycotton with 100% hollow fibre filling, whereas low quality and cheap duvets have a polypropylene cover. ANTI-ALLERGENIC: As hollowfibre is a synthetic fibre, it is suitable for dust and feather allergy sufferers and those with asthma and eczema. EASY CARE: As this duvet is machine washable at relatively high temperatures which dust mites and bacteria are unable to survive, leaving you with clean, durable and fresh bedding. SUMMER BEDDING: This 4.5 tog duvet is perfect for use as a summer duvet due to the thin layer of hollowfibre, keeping you cool and making sure you don't overheat in summer.