Blue Bohemian Tents are made from 100% cotton canvas. It's a good idea to hose the tent down when you first pitch it so the fibres and adjust and expand – making the tent weatherised and thus more weather proof. We are always amazed at how water resistant our canvas tents are - in some cases more than nylon nightmares! Over time and with extended use you may need to re-waterproof. There are many great products on the market for this simply by Googling “bell tent waterproofer”.