What cushions the kidney and helps attach it to posterior body wall?

The kidney is cushioned and attached to the posterior body wall by a layer of fat called the perirenal fat, also called the adipose capsule of the kidney or paranephric fat. The perirenal fat surrounds the kidney and helps to protect it from physical trauma. It also helps to hold the kidney in place and prevents it from moving around too much. The perirenal fat is also a source of energy for the kidney.