Heat regulated and extremely lightweight this quallofil air summer duvet 175gm with allerban anti bacterial anti fungal and anti dust mite treatment plus water repellent and stain resistant treatment will keep you comfortable all night longsynthetic summer duvet quality value for its filling made up exclusively of extra fine silicon hollowfibres ultra plump and ultra lightweight 100 polyester allowing better circulation of air and reducing build up of moisture cover 100 cotto