ShadeMart18' x 18' x 18' Blue Triangle Sun Shade Sail SMTAPT18 Canopy Fabric Cloth Screen, Water Air Permeable & UV Resistant, Heavy Duty, Carport Patio Outdoor - (We Customize Size)

Even though it is not the cotton type. These are perfect. It blocks the sun and allows water to pour in. This is good because when it rains, water will not accumulate on top. If it did, the weight will make the shade sail bend downward. Its better for the water to seap through, that way it does not weight the sail down.Will be buying more.

We were very upset with the poor quality of this product - the material was thin and the weave was loose and inconsistent - the color was also not consistent with numerous white spots

These sails are a little thinner than the last ones I purchased. This is great because they do not sag and bow as bad in Florida rain storms. The rain goes through them well. They do let a little light through at 1 ply like advertised. If you double them up they block 100%. Live these as long as they last a few years. Shipped fast and had great sizing and color options compared to other stores on Amazon. I also appreciated the fact that their store didn't post political garbage like another that sells the same items.

Seems to be good quality. Haven't had a chance to use it much yet

Helps withe hot sun here in Arizona.