Luxury Memory Foam Spring Mattress Reflex Orthopaedic 9 Inch Thick Sizes X2. Features a bonnell spring system. Dust mite resistant and hypo-allergenic, perfect for allergy sufferers Firm feel and Fully compliant with all UK fire regulations. Mattress depth 25 cm (approx 9-10).135.0 cm x 198.0 cm x 25.0 cm. 198 x 135 x 25 cm; 20 Kilograms.