ThermoBalance ® series includes four mattresses all available in Twin, Twin XL, Full, Queen, King, and California King. The ThermoBalance ® series comes fit with a ThermoBalance ® quilted cover complete with Tencel ® for a cool-to-the-touch sleeping surface, an air flow border for drier and cooler sleeping, and a gel-infused memory foam layer for optimal support. The ThermoBalance ® series is designed for hot sleepers so if that's you, you've found your new mattress! The Haven Boxtop is the softest of the ThermoBalance ® series of mattresses. The next firmest mattress in the lineup is the Grandeur. The Haven Boxtop is regularly stocked in queen and king at our facility. Adjustable-base friendly and made in the USA!