The bleaching process removes the natural fiber lubricants – oils and waxes – from cotton fibers. To facilitate efficient processing, a fiber lubricant is needed. The sled test, as a means of measuring fiber-to-fiber friction, will be discussed. How the sled test results relate to the cardability of fiber finished with various lubricants will be shown. How the fiber finish affects the resistance of the fiber batt to needlepunching and how the sled test results correlate with the needled resistance will be shown.