The TENCEL X Naia contains a harmonious blend of TENCEL fibers from Lenzing and Naia fibers from Eastman. The development of this fabric stems from the fact that the regular 100% material composition sheets are harder to maintain and the "feel" changes over time. For some households that is just a pain.The strategic addition of Naia fibers here makes the fabric slightly more crisp without compromising the soft and silkiness of the TENCEL fibers, thus, adding more durability without sacrificing comfort that the 100% TENCEL provides.Also, with different dye absorbency, the result is a cozy linen looking design that brings warmth to a comfy bed.