Indulge in peaceful and supportive sleep with the pocket silk 2500 mattress featuring 2500 individually pocketed springs generous layers of natural wool cashmere and silk and a knitted silk cover this mattress ensures high quality sleep night after night the pocket springs contour to your body resulting in more supportive sleep and the natural wool and silk acclimatises to the environment staying cool in summer and warm in winter the luxurious knitted silk cover is remarkably absorbent