It uses 35D to add softness to your mattress.
Plus Your Mattress with its unique ventilated design to be highly breathable controlling effectively your body temperature throughout all night 3 Inch Mattress Topper Pad Gel Infused Memory Foam Mattress Topper Twin Dimensions: 13.This will be your most cost-effective choice HIGHLY BREATHABLE: Plush 3 inch memory foam topper is infused with gel to help regulate temperature so this topper sleeps cooler than a regular memory foam topper. 3 Inch Mattress Topper Pad Gel Infused Memory Foam Mattress Topper SUPER SOFT & PLUSH COMFORT: Our 3 inch gel memory foam mattress topper offers a contemporary solution for your healthy sleep.