New F3-A model has robust aluminum curtainsider rail profiles. This solution enables maximum space utility ( the rail is only 43mm wide) and high construction strength. Patented frame construction enables easy and reliable tarpaulin roof opening and closing. The key element of this construction is multi layer rubber band that is capable for long term operating with numerous opening and closing. Center pillar rollers locks automatically when the pillars are fastened. Rear end opening is easy and functional due to gas springs relief.