The Freestyle comes in 3 different tensions so the sleeper can be in total comfort to suit their needs and sleeping requirements. Search for the Freestyle Soft and Firm also. The Medium version features Airsprings trademark Duraspring which is a high tensile spring unit. Tucked tightly inside is a system combining two rows of open coil springs which moved when the outer springs are impacted. The result of this is a strong supporting frame that effortlessly takes pressure away from the body.With a medium tension, class in abundance in the finish and some beautiful attention to detail in the fillings, the freestyle range is a choice you'll be very satisfied with.