Cariloha Crazy Soft Classic King Sheets - 4 Piece Bed Sheet Set - 100% Viscose From Bamboo (Blue) COOL: Naturally breathable and moisture-wicking, making these sheets 3 degrees cooler than cotton sheets and keeping you comfortable all year long. CLEAN: Naturally repels odors and allergens. Viscose from Bamboo sheets are a welcome respite from skin irritations that can flare up with other chemically treated fabrics. GREEN: Saves more trees, regenerates naturally without pesticides or chemicals, and is one of the most sustainable resources on the planet. It keeps our soil stronger, our air cleaner and our environment healthier. 100% QUALITY GUARANTEE: Because we believe in our products so much, we offer a lifetime quality guarantee. If you're not 100% satisfied with the quality, then we'll exchange the item for you. Simply go to Return.Cariloha.com or contact us at 1.800.884.5815 and we'd be happy to help. Or, if you're completely satisfied, we'd love to hear your passion for your new purchase as well.