I purchased this in red to block the late afternoon sun that was making it impossible to spend time on my patio.  It was just to hot to go out to grill dinner or just sit outside and enjoy summer.  This "sail" is made from a strong fabric/plastic weave that can withstand weather conditions.  I have a small patio area and no trees; but using some creativity it is up and now we can spend more time outside.  I would recommend this item to others, but think about how/where it will be used.