UPGRADE GALVANIZED MTAL FRAME: this large tunnel walk in greenhouse is made of a premium galvanized finished heavy duty steel frame. The cross bars and 4 reinforced diagonal bars add extra stability to prolong the serivce life HIGH QUALITY PE COVER: our indoor and outdoor green house designed with 140g/m2 PE plastic grid cover, which will provide an ideal house for your plants, potted flowers, vegetables, herb; and protect them from frost, rains and too hot or too cold weather Ventilated Windows & Door: this portable greenhouse has 6 mesh windows and 1 door to keep air circulation and ventilation, and provide a stable growth environment for plants and make them flourish FOR ANY SEASON & ANYWHERE: 10×6.6×6.6ft winter greenhouse house means that you can extend the growing season for your mini small and large plants. You can set it in the garden, backyard, patio, outdoors or anywhere GREAT SERVICE: we have professional team, if there is any quality issue about the item, please feel free to contact us, and you will get a quick and satisfied response Outdoor Greenhouse Large