Zenport cold frame greenhouse is suitable for seed planting and protecting fragile sprouts from the elements. Provide excellent weather protection for all your plants. Long-lasting, maintenance-free aluminum frame. Polycarbonate panels are virtually unbreakable. Suitable for both balcony and garden. Two opening rooftops can slide out or lift up to prevent overheating. The clear polycarbonate cover allows full sun exposure while keeping out the cold. This is an affordable greenhouse with extra height and double covers for the ambitious.