A smooth to the touch 400 thread count organic cotton extra soft sateen king pillowcase set perfect for all weather, especially the hotter season. The organic cotton has a cooler feel than polyester due to its natural breathability. Hydrogen Peroxide Whitened with a stitched in thin stripe design. Softens further after washing. Machine wash and dry on regular. Add 1/4 cup of vinegar to the load to increase softeness. Fabric is not pre-shrunk and will shrink to the proper size once washed and dried. Made in the USA. Ships out within 1 to 2 business days.