The Huntleigh Alpha Active Micro Air Loss Mattress Replacement System is recommended for patients at medium risk of developing pressure ulcers. The pressure prevention mattress uses alternating cells to continuously redistribute support & relieve pressure. The cells in the thoradic/sacral region provide ventilation to reduce skin maceration. The cover is water resistant and made from 2-way stretch, vapor permeable and easy-to-clean material. The pump is quiet, energy-efficient and vibration free.