Sleep is an elusive, enigmatic activity. Bill Bryson said in The Body, no one knows exactly why we sleep — to consolidate memories, reset the immune system, restore hormonal balance, or clear metabolic waste and neurotoxins? While all of these processes do happen while we sleep, science still cannot say for certain why we need it so. One thing SERWALL does know is that sleep is vital to every living creature. Unfortunately, many people don’t get the quality of sleep they need each night. SERWALL Committed to creating the best quality of sleep. Compared with other brands, this mattress topper cover is much more thick which hits 2". Extra padding also supports your body better, spreading your weight evenly across the bed and waking up with less back pain. 400TC 100% cotton, gives superior comfort against your skin without extra heat and sweat. And 8-21" deep pocket keeps your mattress topper firmly fixed on your bed.