Balance of natural materials. The Woola W1000 mattress is a classic rolled edge design, zero roll together and supportive for all night support. Certified natural latex layer with NZ wool and alpaca for soft, silky comfort. Alpaca is an environmentally friendly fibre, to produce the wool no harsh or detrimental chemicals are required. Alpaca wool is soft and ideal for people with sensitive skin, as the wool is very soft and silk like. Two feels available: Medium or Firm