The VIVOSUN Hydroponic Mylar Grow Tent features extra-thick 600D canvas with metal poles and corner adapters, so it’s very stable and airtight. Unique diamond reflective Mylar design provides 98% grow light reflection and offers a superior indoor growing environment. Provides plenty of ventilation that can be closed or opened using the cables, ducting, and fans. The light green metal poles lock in place with no extra hardware needed.