To be sure that the garment is really waterproof, it is not just the waterpillar that you have to keep an eye on. Because even if the material in the garment has a high waterpillar, water can seep in through seams, pockets and zippers. Therefore, taped seams are important to keep an eye on if you want a 100% waterproof garment. Good to know; for a garment to be said to be 100% waterproof, the seams must also be waterproof.