This clothing insulation material is made from used PET bottles and oyster shells. Its low thermal conductivity ensures Smawarm retains heat exceptionally well. The multi-layered construction is designed so that the outer layer consists of both robust and soft hollow fibres. The denser middle layer increases heat retention. The product offers further benefits in addition to its original function. It is antistatic and antibacterial; it dries quickly and is odour blocking. It is also mite-free and offers a good warmth-to-weight ratio.