Spring mattress ecomemory fibres airflow border edge to edge support moulding memory foam dust mite resistant mattress size double mattress width 135 cm mattress width ft 4ft 6in mattress length 190 cm mattress length ft 6ft 3in mattress height 28 cm cover characteristics suitable for allergy sufferers firmness mediumfirm body adjustment 7 ergonomic zones series silentnight moscow