San Diego Sail Shades - "Waterproof" 20'x16' Square Shade Stylish and versatile protection from the sun's harmful UV rays. Keeps you cool throughout the year Perfect solution for your outdoor areas, giving them a stunning contemporary look Waterproof and easy to install # High density Available in either square, triangular, right angle triangular and rectangular shapes. These can be used alone or in combination to shade the required area.