Solid Linen 300 Thread Count Twin Size 2PC Duvet Cover Set 100 % Cotton with button enclosure Cotton Duvet Set 100% Combed Cotton 300 Thread Count Duvet cover has 4 inner ties and Hidden button closure by footer Twin/Twin-XLong Duvet Set: 1-Duvet Cover 66x90" 1-Pillow Sham 20x26" Duvet is to duvet cover as pillow is to pillowcase. A duvet cover is a protective layer that slips over the duvet and has a closure. Care Instructions: Machine washable in cold water