All season weight 9 tog duvet , 100% Grade A long-fibre Mulberry silk, Pure cotton sateen 300 thread count casing , Hypo-allergenic, Resistant to dust mites, relief from itchy skin conditions such as rosacea and eczema and also relieve aches and pains caused by such ailments as arthritis and rheumatism. , Box and circle stitching keeps the filling evenly distributed. , Rarely requires cleaning, air outside on a sunny day to freshen up