When a person is stationary for a long time, for example when sleeping or sitting, the prolonged pressure on the skin can lead to a lack of blood supplied to the area, causing the tissue to die.
Shear injury occurs when the skin and bones move continually in the wrong direction; it will not be seen at the skin level because it happens beneath the skin. However, shearing will rarely occur without friction.
This is how pressure ulcers develop. Bony areas such as hips, elbows, heels, and the tailbone are particularly susceptible.
Our lambswool fleece protectors cushion these bony areas, by absorbing pressure, and our Repose Foot Protector off-loads pressure on the heels totally.