Jiffy Grip is the most commonly recognized fabric for soles of footy pajamas and slipper soles. The flannel backed fabric is coated with no-slip dots which help prevent skidding of slippery floors. The base fabric is a slightly off white color with white dots. I have seen this fabric last an entire season of slipper wearing before it started to disintegrate. The plain dots allow you to change the direction you are cutting out pieces on the grain lines without effecting the finished appearance.