The majority of the tents we stock now have a fully sewn in groundsheet. This enables campers to use the tents what ever the weather as in severe storms and floods the water can run around or even under the tent keeping you fully protected inside. It also eliminates drafts and keeps you a great deal warmer inside. Many believe that a sewn in groundsheet also keeps out unwanted bugs and insects as it is more difficult for them to get in. This feature certainly helps to pitch quicker as you can ensure the tent groundsheet is pulled tight by pegging down the corners before you erect the tent. No more chasing the flysheet along as you try to insert a pole to the sleeve. We all like a simple life!