Comforter Duvet Insert: Twin size Comforter Duvet Insert measures 64 inches x 88 inches. Box Style Stitching: Crisp looking comforter features an elegant box stitching that prevent the fill from shifting. Siliconized Fiberfill: Extremely soft material with siliconized fiberfill alternative filling provides a comfy and cozy feel. All-Season Comforter: The classic style of the down alternative comforter makes it suitable for all weather conditions to ensure a blissful sleep every night. Machine washable: Machine wash in the gentle cycle with cold water, sun-dry or tumble dry no heat.