3 Layers for Better Insulation: Winter insulation window is made of high density weatherproof oxford fabric outside and cotton filling inside, can effectively block out cold wind/air, reduce indoor heat loss and improve energy saving, keep indoors warm in cold winter.

3 Layers for Better Insulation: Winter insulation window is made of high density weatherproof oxford fabric outside and cotton filling inside, can effectively block out cold wind/air, reduce indoor heat loss and improve energy saving, keep indoors warm in cold winter.