It's like a mini-greenhouse for your garden rows- keeps inside temperatures up to 25 F warmer than outside air. Sun and warmth get in, cold stays out. You can plant earlier than ever and also harvest well into the colder months. TunLcover acts as a miniature and cost effective greenhouse protecting plants from harsh conditions like frost, wind chill and garden pests. Takes only minutes to setup and extends like an accordion up to 18 ft. TunLcover plant protectors consist of a 2 layer UV protected cover with thick gauge wire hoops pre-installed every 2 ft. Use as much or as little as you need. Simply stretch out the TunLcover, pushing the hoops into the ground at the preset intervals and you're done! Two end flaps for adjusting ventilation. Re-usable.