Threshold Twin XL Performance Sheet Set (Blue) Flat sheet, Fitted, Pillowcase The Threshold Twin XL Performance Sheet Set in Blue is a modern and stylish addition to any bedroom. Made of 100% cotton, this sheet set includes a flat sheet, fitted sheet, and pillowcase, all in a solid blue color. Easy to care for with machine washable instructions, this set is designed for comfort and durability. Perfect for a Twin Extra Long bed, this sheet set is a practical and attractive choice for a contemporary bedroom decor.