LUSOME Temperature Regulating Sheets are designed for sleepers who run warm and want a cooler, more comfortable night. Powered by Xirotex Cool technology, the fabric is made to help manage heat so you are less likely to overheat as you rest. The result is a smooth, breathable sleep surface that feels elevated but easy to live with. These sheets absorb and release heat energy to help maintain a more consistent, ideal sleep temperature. In a clinical trial, participants slept an average of 26 minutes longer per night. If night sweats and temperature swings interrupt your sleep, this performance-driven approach can help support a more uninterrupted routine. The 400 thread count cotton is ultra soft with a luxuriously smooth hand feel. The fitted sheet is designed to fit mattresses up to 18 inches deep, with all-around elastic and reinforced corner bands for a secure, stay-put fit. If you want help choosing the right bedding for your sleep style, Mattress Firm Sleep Experts® are here, because we make sleep easy.