Abstract: A retractable cover which includes a flexible material portion having at least one biasing mechanism. The biasing mechanism is a spring with either constant or varied force that allows the flexible material to be rolled up. The retractable cover is particularly applicable to tents or temporary structures, but could also be applied to window covers, awnings, truck sidings boat canopies or the like. The biasing mechanism may be placed in a sheath which includes a zipper or the like, so that the biasing mechanism can be easily replaced or added to. Additionally, zippers can be positioned at the sides of the retractable cover to allow the securing of the cover at any height.