Jul 10, · It’s lightweight, waterproof and puncture resistant, which is why people use it as an ultralight groundsheet. It will also last for multiple seasons because it’s so tough. You can buy Tyvek HomeWrap by the foot on henan okay, cut off a 9′ roll. Tarptent.com also sells Tyvek groundsheets that are sized for the tents they sell, for $12-$15