If you’re looking for a supportive topper to keep you cool, the 4” Viscosoft Active Cooling Mattress Topper is just the ticket. Our hot sleeper found the copper-infused foam layer and phase ...

And though the material has a reputation for trapping heat, according to two of the 13 experts we talked to, this ViscoSoft topper stays surprisingly cool. It’s infused with copper, a common ...