With layers of blended British wool and viscose, sumptuous mohair, home-grown hemp and flax and crisp cooling Egyptian cotton. The Lavender has 18400 innovative springs. With an in-house woven FR chemical free mattress cover and three rows of hand side stitching, this Seasonal Turn mattress has a warming wool winter side and cooling cotton summer side. Available as a 3', 4'6", 5" & 6" with a choice of mattress tension: Gentle, Medium or Firm.