The Mattress Topper Company - Dual Layer Mattress Topper - Double - Mattress Topper - Hollowfibre Fillings - Hypoallergenic Mattress Topper - Machine Washable. A luxuriously breathable mattress topper with air mesh walls for a cooler, sounder night’s sleep. Add breathable comfort to any mattress with our Double Comfort Mattress Topper, specifically crafted with breathable air mesh walls so you can be cooler and drier throughout the night. Created with generously filled, double layers of soft and bouncy hollowfibre, this topper softly supports your body while reducing pressure and pain. It’s hypoallergenic, fully machine washable and is enclosed in a soft touch microfibre cover.