True Low air Loss mattresses are said to be the most comfortable mattresses available in hospitals for the treatment of chronic pain, stage 4 bed sores, pressure relief , and heat and sweating of the skin. These true low air loss mattresses operate using a blower based pump to wick await moisture leaving the skin cool and dry. True Low Air Loss Mattress systems come with a variety of upgrades such as alternating pressure and pulsation features. These hospital air mattresses are the perfect solution for bed sore prevention, healing and chronic pain. Free Shipping usually delivers in 2-3 business days.