Sheepskin Cot LinerLambskin underlays are an age old method of keeping babies comfortable and sweat free. This is because of the unique temperature regulating qualities of sheep wool. They can be used throughout the year, keeping baby warm in winter and cool in summer. It has been scientifically proven that babies sleep better on sheepskin. See our blog Lambs Wool Underlay for Babies . For a better nights sleep for baby ( and for you), a lambskin underlay is a must.