Miralor USA, Inc. - Case Covers These are covers used for cold cases after your store closes or during a power outage to conserve energy or keep your foods cold during an outage. I have 6' and 4' curtains (mostly 6').. Make an offer on 1 or all. these are the California Gold style which says will keep product for 6 hours. Open to Offers I have around 30 of these. they come in 6 ft and 4 ft lengths. I have mainly 6 footers.