Open racks, from a three-tier fabric shelf to a ten-tier vertical tower. Capacity is quoted in pairs and assumes ordinary adult footwear laid flat – boots and bulky trainers reduce it.Two features are worth paying for: shelves that adjust in height, so one tier can be opened up for boots, and shelves that tilt, which stops shoes sliding forward. Fabric-shelved racks are the lightest and cheapest; steel and stainless frames take real weight and cope with a damp entrance.