You will love this ultra light synthetic duvet 150gm filled with thinsulate fibres for thermal insulation and a lighter weight feelthis ultra light synthetic duvet has thinsulate microfibre filling a high tech fibre with proven capability used in garments worn for skiing and extreme expeditions ultra light and ultra soft these microfibres store up and release body heat whilst the low volume filling allows moisture to circulate freely thanks to the light filling the duvet can be machine