If you've been trying to sleep on a too-firm or uncomfortable mattress, it's time to add a plush and supportive comfort layer. The Lucid Comfort Collection Gel and Aloe Vera Mattress Topper in a 4-inch profile is the perfect choice. Memory foam is well known for its contouring comfort, and the cooling gel infusion helps to dissipate body heat while the aloe vera keeps your sleep space fresh. The optional cover helps add an extra soft and breathable layer to your topper while also providing protection. The cover is machine washable so you can keep your topper looking and smelling fresh Plus, our memory foam is always CertiPUR-US certified and safe from harmful chemicals. Product Features: COOLER SLEEP: Cooling gel is infused in the memory foam to help regulate your sleep temperature FRESHER FEEL: The aloe vera infusion creates a refreshing sleep environment CONTOURING COMFORT: Memory foam topper helps align your back, hips, and shoulders ULTRA PLUSH: This 4-inch topper adds an ultra-plush layer to your too-firm mattress HYPOALLERGENIC: All our memory foam is CertiPUR-US certified, 100% free from harmful chemicals OPTIONAL COVER: The optional soft and breathable cover adds an extra layer of comfort and an easy-to-clean barrier between you and the foam. The zippered cover is easy to remove and machine washable 3-YEAR WARRANTY: Our quality construction and materials are guaranteed with a 3-year warranty PROTECT YOUR BED: We highly recommend using a Lucid Comfort Collection mattress protector SHIPS IN A BOX: Topper is compressed and shipped in a box, takes 24-48 hours to decompress Dimensions: Cal King: 70 inches wide x 82 inches long x 4 inches high Full: 51.5 inches wide x 73 inches long x 4 inches high King: 74 inches wide x 78 inches long x 4 inches high Queen: 58 inches wide x 78 inches long x 4 inches high Twin: 36.5 inches wide x 73 inches long x 4 inches high Twin XL: 36.5 inches wide x 78 inches long x 4 inches high