Puressential synthetic duvet heat regulated and extremely lightweight duvet with silicon hollowfibre filling the cover is protected against dust mites by puressential treatment with 100 naturally biodegradable active ingredientspuressential synthetic duvet filling made up exclusively of extra fine silicon hollowfibres ultra plump and ultra lightweight 100 polyester 400 gm allowing better circulation of air and reducing build up of moisture 100 cotton cover with puressential dust