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In low air loss
systems, the patient lies on a loose-fitting, waterproof cover that is placed over the
cushions. The waterproof covers are designed to have air pass through the pores of the
fabric and are usually made of a special nylon or polytetrafluorethylene fabric with high
moisture vapor permeability. Manufacturers have addressed the problem of dehydration of
the skin by altering the number, size and configuration of the pores in the covers . The
material is very smooth with a low coefficient of friction, bacteria impermeable, and easy
to clean .
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