The fill used in the Puffy Duvet Insert is a game-changer. Made from premium hypoallergenic materials, it caters to individuals with allergies or sensitivities, providing a safe and healthy sleeping environment. The fill offers exceptional insulation without being too heavy, striking the perfect balance between warmth and breathability The fill offers exceptional insulation without being too heavy, striking the perfect balance between warmth and breathability The fill offers exceptional insulation without being too heavy, striking the perfect balance between warmth and breathability The fill offers exceptional insulation without being too heavy, striking the perfect balance between warmth and breathabilitypuffy duvet insert. It traps just the right amount of body heat to keep you warm on chilly nights while allowing air to circulate, preventing overheating during warmer months.