Before CopPure arrived, I gave up sleeping in my old bed. I spent over a year sleeping on the couch in the family room because I couldn't sleep more than two hours on my old mattress without waking up with an aching back and drenched in sweat. I tried about every bed accessory available: memory foam mattress topper, mattress cooler that pumped cooled water through coils embedded within a sheet topper, multiple pillows, each promising better sleep - nope!. My X-5 Twin XL mattress has allowed me to return to bed for sleep. I can now sleep through most of the day (I work nights) instead of wandering the house like a zombie, only to pass out on the couch. There's no more aching back, no more sinking into the memory foam topper, and my body is so much cooler upon waking, it feel like I really slept!!! Thank you CopPure, for sending a mattress that can withstand the stresses of a 6'8", 400+ pound sleeping giant.