Ecoshield is the result of a genuine desire to combine science and nature in the fight against insects. The active ingredient of Ecoshield treatment is 100% natural and based on the oil of the Eucalyptus Citriodora tree. Completely harmless to humans, its renowned for its insect repellent qualities. All fibre and textile materials treated by Ecoshiled are wash-resistant, thanks to microcapule technology. This technology permits the active ingredient to be released gradually over time, since the capsules only break open when using the mattress.• 13.5 gauge spring unit with extra firm edge• Luxury fillings including polyester• Anti bug resistant• Base available in a range of colours