As part of our continuous effort to improve our products and technologies, we are happy to introduce another improvement of our QM FOAM technology. Air Vents are small plugs integrated in the base of the foam that function as a pressure regulator inside the foam. They are either presented as small integrated holes (Original QM FOAM), or as protective pads (Heavy Duty QM FOAM) at the bottom of the furniture. Air Vents do not change or reduce any of the existing properties of QM FOAM we all appreciate like water and weather resistance, UV stability, etc.