100% ORGANIC PURE BAMBOO – the BAMPURE bamboo pillow cases are crafted from 100% organic bamboo viscose grown in a chemical-free environment.BREATHABLE AND ODOR RESISTANT – our super soft pillow cases are extremely breathable so naturally resist odors as well as keeping you cool and keeping you free from night sweats.LUXURIOUS SOFT AND SILKY SATEEN WEAVE – results in a luxurious and durable pillow case. Plus these pillowcases king size are designed to soften with each wash ensuring increasingly cozy nights over time.2 PIECE PREMIUM ENVELOPE PILLOWCASE SET – included in this deluxe set are 2 bamboo cool pillow cases with envelope closure end design. These pillowcases king size are 20?? x 40??.READ THE MANUAL CAREFULLY – Please read the instruction manual provided with the BAMPURE pillow cases set closely before use. If you have any questions or issues regarding the set please do not hesitate to send the seller a message through Amazon and we will respond within 24 hours.