Material: Cotton-polyester blend delivers quiet, non-irritating texture suitable for sensitive skin. Moisture-wicking weave balances temperature year-round, while anti-static treatment cuts hair tangling and dust buildup. A full zipper keeps the pillow fully enclosed to block pollen and small floating particles.Size: Multiple sizing options cover 19x29, 20x28, 21x27, 21x31 and 21x37 inches to fit standard and larger pillow inserts of all common bed styles.Occasions: Each pack holds two covers for residential bedrooms, rental properties, hotels, dorm rooms and RVs, fitting regular daily rest and temporary travel stays.Care: Machine washable construction holds its form through repeated cleaning cycles. Sturdy zipper hardware maintains full enclosure performance after many wash cycles for long term daily use.