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Low air loss beds use fluid (air) technology to distribute pressure through the principle of immersion. The deeper the immersion, the greater the surface area for pressure distribution. These devices permit adjustment of the air inflation level to increase the immersion and pressure distribution. These devices are capable of achieving moderate to large deformations without large restoring or shear forces.

The volume of air may be adjusted to provide more or less immersion for the body as a whole or for specific sections or even individual chambers or cells. The loose-fitting covers envelop and decrease friction. In fact, care must be taken to avoid sliding patients off the mattress during bed transfers.