Sleep healthy with the moisture-managing qualities of bamboo viscose used in this sheet set. Experience softness like never before. The cooling performance of bamboo is enhanced with the strength of luxurious high quality extra long staple cotton. All jinyu sheet lines are made with the following quality features: patented jinyu guaranteed to fit & guaranteed to stay on. Construction fits any sized mattress. Dreamflex patented corner bands for a secure fit. Dreamflex 360 elastic band for a tailored fit.