Authentic Comfort 2-in. Cal. King Biofresh Gel Memory Foam Mattress Topper - 71 x 83 Give your bed an extra layer of comfort with the BioFresh Gel Memory Foam Topper from Authentic Comfort. Made in the USA, the BioFresh memory foam is infused with micro-gel for personalized support and odor neutralized to keep it fresh. Protecting the durable foam is a Nano-Tex Coolest Comfort cover that provides breathability and keeps moisture at bay.