Replacement Alto TR 1 one-person mesh inner tent or w arm-weather Alto upgrade - use with your TR 1 Plus tent when you need additional airflow. Features Dark grey mesh walls provide excellent airflow and visibility To extend the life of your tent floor we recommend using a Sea to Summit footprint - sold separately Construction and Materials The 6” deep 15D nylon tub floor is rated to 1200mm hydrostatic head – ultralight, waterproof and durable Ultra-lightweight 15D polyester mesh inner for maximum ventilation