Sealy continued their quest for the world to sleep better for decades to come. Milestones include the introduction of the Sealy Posturepedic mattress. Being the first mattress company to display and advertise a king-sized bed. Creating an Orthopedic Advisory Board. Reinventing the innerspring coil and the box spring. Patenting a variety of groundbreaking technologies, including Posture Channels and Pressure Relief Inlays designed to relieve pressure points that cause tossing and turning. more... See more text