The KM19 silicone hollow fibre mattress is cylinder-shaped, and hermetically closed with preshrunk cotton cover. The interior contains 100% 14 denier polyester fibre, with the following characteristics: - Hollow, and multi-channel, for ideal resilience and breathability; - conjugated with silicone wires to allow for quick rebound from the stresses of body weight; - siliconised to prevent amassing and preserve elasticity; - it does not come in contact with natural rubber latex proteins during any stage of processing. The amount of conjugated silicone hollow fibre is such that a good response to load is provided. The exterior is made of preshrunk cotton, a shrink-proof fabric.