Sun sail shades, or triangular awnings, are a practical and beautiful way to create shade and rain protection. Constructed of heavy duty, weather resistant canvas, the sun sail shade gets its name from how it replicates the shape of a sail you would find on a boat. These shades are very welcome diversions from traditional rectangular awnings. The triangular shape lends itself to all kinds of customization. If you have certain parts of your patio or yard that you want covered, you can custom design the sun sail shade to do just that. Also, they are quite easy to stretch taut and to mount on structures like trees, poles and roof joists that extend from your home.