100% Cotton Imported Fabric: Double Brushed Cotton Flannel with velvet feel - Oeko-Tex Certification: Made in Green certification from Oeko-Tex. Tested for harmful substances and produced sustainably in accordance with Oeko-Tex guidelines. Extra size: Oversized flat sheet and pillow cases. Fitted Sheet fits up to 18" Mattress and has elastic all around European closure on the pillow cases: The pillowcase have a flap on one side so the pillow hides under the flap and is not visible from the pillowcase opening. Easy care - Made of fine material that holds up to repeated washing. Washing Instructions: Please see sewn-in care label for care instructions. King sheet set includes: 1 flat sheet: 104x 110, 1 fitted sheet: 80x 78, and 2 pillow cases: 41x 21