They are water-resistant and mold resistant, and are appropriate for light showers. That being said, the real issue is that pop-up tents are not designed to withstand heavy rain, as the water pools in the fabric on top and becomes a weight on the frame. After a certain threshold, this will damage the trusses and bend the frame, so we never recommend using any pop-ups for harsh weather. If you need a permanent outdoor structure, we recommend looking into our Event Tents by Tentnology.