Cover is 100 % Polyester Medium Feel - Made For All sleeping positions; The new T&N Original Hybrid medium mattress is intentionally designed with innovative materials for responsive comfort and overall, enhanced wellness; It is Assembled in the USA for the highest quality Responsive Comfort - The mattress's T&N Flex foam responds to your body weight, firming the deeper you settle into the mattress for responsive comfort, unique to you; while it's ventilated T&N Release foam enhances pressure relief for all-night comfort Bounce-Back Support - T&N Adaptive foam is a breathable, open-cell foam, infused with cooling gel and graphite to help wick away heat and provide pressure relief and support; While foam-encased individually-wrapped coils help lower motion transfer Exceptional Cooling - Topped with a quality cover that includes cooling technology; The T&N Original Hybrid mattress provides up to 15% better airflow for a refreshing night’s sleep when compared to the Tuft & Needle Original mattress This product comes compressed in a box with both a 100-Night Sleep Trial and 10 Year Limited Warranty; and is certified by both CertiPUR-US and GREENGUARD Gold; Please allow two weeks of use for your mattress to break in and air out