VALUXE 3 Inch Gel Memory Foam Mattress Topper Twin Size High Density Cooling Pad Pressure Relief Bed Topper (with Removable & Washable Bamboo Cover)High-density Memory Foam Made of 40D (approximately 3.5 lbs/cubic foot) high-density aviation-grade memory foam and gel beads to provide good support while maintaining the highest air permeabilityImprove sleep quality The 3-inch memory mattress fits the body curve and perfectly fits the body contour. Provide you with support anytime, anywhere, without any rebound pressure. Keep the spine in a neutral position, relax the muscles, and reduce morning soreness.Rest assured and reliableCertiPUR-US certified foam meets rigorous standards for content, emissions and durabilityBamboo Fiber Cover: bamboo cover is certificated OEKO-TEX , Use skin-friendly and breathable bamboo fiber, with adjustable elastic straps and anti-slip surface backing to prevent sliding. Zipper closure for convenient disassembly and washing.Size and instructions for use Twin 39 x 75 x 3 inches Before first use, pls unzip and remove the cover, leave the memory foam flatly in a well ventilated area for 24-48 hours until its fully expanded. 10-year warranty, free replacement of non-human damage within 2 years.Necessary maintenance: 180 horizontal flip every other month