Barrier free or collapsible mosquito nets is a unique mosquito net system and a great solution for huge openings. It gives wider openings to allow sunlight and fresh air to pass but meshed closely enough to keep insects out. This screens works on spring less technology with PVC based chain along the runner in the floor. Trackless retractable will not stumble or trip children or adults (safety). It has the option to use a single shutter to twin shutter openings. It can be suggested to doors, balconies, French doors with larger openings. This mesh pleated polyester water proofing mesh.