Fail A lot of experiments went into this research. Here are some that failed. Save yourself time and do not repeat my mistakes. Polyester mattress stopper is a really nasty stuff! Polyester for softness – terrible, do not do it Trying to limit spring tension to produce a slightly dented mattress surface. Fail. Not using scissors to cut memory foam. Just ugly. Using plastic to hold the PVC vent. A fail. Yeah, my ass was sore! This was a partial fail. A pool vacuum tube as a vent was rattling against the metal coil. A big mattress hold and a fan on the floor blowing up. A very big fail.