The Retractable Dock Shelter fits up to a 120"W x 120"H door. Independent manual scissor mechanism allows shelter to retract with the trailer keeping the shelter square. The design also eliminates the need for rigid steel guide protectors. The reinforced 40 oz. black vinyl-coated nylon flaps close the opening down to 90"W x 90"H. The 36" header curtain has armor pleats for extended wear. Shelter is black with aluminum edge trim. Optional Draft Pads, model D-520-24-DP, help prevent air from coming up underneath the dock flaps. Units are non-returnable.