Vinyl shower curtains are 100% waterproof. The sides and bottom are cut rather than sewn and eyelets are welded into the plastic. Because these curtains are made from plastic they should be wiped clean with a damp cloth and hung out to dry; they cannot be machine washed, dry cleaned, tumble dried or ironed.
PEVA is a fully waterproof material that has a soft, "fabric like" texture. PEVA has to be Corona treated before it can be printed on making it one of the more expensive vinyl materials.