Across the full range of Crua tents we use a TPU laminated poly-cotton fabric that is fully waterproof. The walls are also breathable and remarkably durable. In an effort to prevent holes and water leaks through the ground, we designed in a very tough PE floor. Plus, we include a supplementary PE groundsheet to add an extra layer of protection between you and the ground. Click here for more info on our waterproof tent technology and check out our range of waterproof tents below: