A support surface, such as an underpad, for preventing pressure sores in a patient is a multi-layer textile assembly having a skin contact layer formed from a fabric of synthetic filament yarns woven to provide air permeability and moisture vapor permeability and having a thickness of less than 1 mm....http://www.google.es/patents/US8011041?utm_source=gb-gplus-sharePatente US8011041 - Devices for prevention of pressure ulcers
