The Cumulus® Top Cover incorporates wash-activated patterning woven with patented Centium Core Technology®. A blend of polyester and cotton assures lasting performance and softness. Centium Core Technology® from Standard Textile dramatically extends the top cover’s service life and enhances performance. A reduced overall product weight means decreased drying time and significant processing cost savings. Cumulus does not require ironing and ironing is not recommended. 65% Ring Spun Combed Cotton 35% Centium® Core Microfilament Polyester Product must be laundered in hot water (140°F or higher) prior to first use. 2" Top and Bottom Hem Used by Courtyard, Fairfield Inn, Spring Hill Suites, Residence Inn, Town Place Suites and other Hoteliers Mdae in the USA