Center lock: 10×20 pop up canopy features patented press-on center locking technology. Simply press the 10×20 canopy tent center hub, and 1-2 people can quickly lock the tent poles in place to complete the setup. Air vent: 10×20 party tent with sidewalls has a vent on the top, which helps air circulation inside the tent. And the top is coated with silver to lower the temperature inside pop up gazebo in hot summer. Adjustable height: 10×20 pop up tent foot poles are equipped with thumb buttons, easily adjusted to three heights, 10×20 tent offers three height options: 103.2 inches, 110.3 inches, and 117.4 inches. Removable sidewalls: 10×20 canopy tent with sidewalls has 6 sides, including 2 door panels and 4 window panels. Each panel is detachable and interchangeable can be freely combined. For example, you can set up a canopy tent with all side walls in winter or one without side walls in summer. Package List: 10×20 outdoor canopy frame, 10×20 ft canopy top tarpaulin, 6 removable oxford cloth side walls, 4 sandbags, 1 handbag, 12 tent stakes and 4 ropes. Use ground pegs and ropes to make the party tent more stable. We offer a 1-year after-sales protection for your peace of mind, ensuring your satisfaction with our product. We ONLY accept the return for original package. Please make sure that item has NO man-made sabotage. Used items will not be accepted for return. You bought wrong model or wrong color. We promise to help you solve it asap, and make you feel satisfactory absolutely.