I purchased a black mesh that blocks 70% for a simple boom cover. The nice thing is wind doesn't effect it much.
https://www.tarpsplus.com/black-mesh-tarps-screen-covers.html
My wife then said a little more blocking would be nice so I purchased this tan mesh that blocks 86%. I haven't tried it yet since they were out of stock and it didn't arrive until the boat was out of the water.
https://www.tarpsupply.com/86-super-shade-mesh-tarps.html
https://www.tarpsplus.com/black-mesh-tarps-screen-covers.html
My wife then said a little more blocking would be nice so I purchased this tan mesh that blocks 86%. I haven't tried it yet since they were out of stock and it didn't arrive until the boat was out of the water.
https://www.tarpsupply.com/86-super-shade-mesh-tarps.html