Provides frost protection for early and late crops and protects tender plants from wind, hard rains and sun scorch. Also guards aganist insect, bird and animal damage. For ventilation, tunnel has an elastic end closure with clips and ground pegs (included) or simply fold back the end. Sets up quickly with sturdy wire hoops that are sewn into the fabric. simply extend the tunnel and insert the hoop ends into the ground. Sides lift up to allow easy access to plants. Measures 9'8" long x 20" wuide x 18" high.