This Gold Mountain Single Truss Arch Storage Shelter W30’xL65’xH15′ has openings for both ends. This outdoor canopy storage shelter is waterproof and UV resistant and can protect your belongings very well if you live near the ocean with humid air. This storage tent is easy to assemble and fast to build. The PE Polyethylene material is tough and durable, and will not be torn by weather. The storage shelter has multifunctional outdoor usage: agricultural/industrial/commercial warehouses, storage for trucks/vehicles/boats, outdoor events/weddings/activities. It’s necessary to tighten the roof fabric enough to avoid ”hammocks” on the roof and also re-tighten once or twice again after a few months of use. This is important when assembly in cold weather autumn and winter because the fabric is stiff then and when we got the sun and warm weather afterward it will make the fabric ”slack” again and need to be re-tighten before next winter.It’s the owners’ responsibility to take off snow immediately if not slide off by itself.