https://www.bunkbedsstore.uk/p....roducts/wilson-bunk-
Double Mattress Pocket Spring Pocket sprung mattresses feature layers of natural fillings like wool, cotton, and horsehair. These materials are eco-friendly and aid in keeping your mattress breathable, perfect if you're suffering from asthma or hayfever. The springs are not dependent on each other, which reduces the "roll together" effect that is common when using other mattresses. They can be customised to your preferences by altering the number of springs and the wire gauge. Enhanced Pressure Relief