Pop-top caravans are built along the same lines as a full or standard caravan except that the roof can be raised and lowered. To allow the roof section to be raised and lowered whilst still providing interior protection, a 300 to 400mm gusset, which is typically made of vinyl or canvas. This skirting ensures a waterproof and windproof seal and commonly has zippered sections that can be opened to allow airflow through the caravan. These are made with flyscreens – similar to tent window screens, which are used to keep out mosquitoes, flies and other insects. The roof mechanism generally comprises of spring assisted scissor lifts and gas struts, although to make it even easier to 'pop the top', many manufacturers are now implementing 'easy lift' handles. Now a pop-top caravan may not have the full-height door and an abundance of big overhead cupboards which is quite evident in a full sized caravan. However, when the pop-top roof is raised, there's plenty of height and living space, sections can be opened out to let fresh air circulate inside and it doesn’t take all that long to set up or pack down.