The topper has two layers, boasting a 3" slab of gel-infused air ... Casper's 10% off sale on all sizes except twin XL and full. Testers for the Casper Comfy Mattress Topper review were surprised ...

It lacks the copper-infused foam of the Active Cooling Topper, but it does offer a choice between two heights (3 or 4 ... sleeping on a twin-size Viscosoft Active Cooling Mattress Topper.