Rayo is a leading name in the Sleep Industry. Its by no mistake that there Name is on this product. Top of the line, this isnt a cheap egg crate. It arrives  is wrapped tight. It took two to unroll it. After getting the plastic off I left it on my clean bed. About an hour later it was expanded  ready for sheeting. The sleep is phenomenal on this unit. I just had my L-5 removed  it sleeps great. Not to soft, not to firm, cool sleep with Zero mattress heat.