The 14’’ Nectar Premier Copper mattress is the brand’s tallest, coolest, and most supportive mattress. The breathable poly-blend cover features heat-conductive copper fibers plus heat wicking technology for a cool-to-touch sensation. There’s also a layer of of gel-infused memory foam with phase-change material, which is designed to react to your rising and dropping body temperature for the deepest, coolest sleep. Its five total layers includes extra inches on both the comfort layer and base for maximum dynamic support, pressure relief, and extra softness. Nectar mattresses come in a box and are made in the USA.