Shade sails are square or triangular fabric covers that can be stretched from posts, trees, or anchored from house to ground. They create shade in areas that otherwise not have a shading option. With less formal structure, they are easier to place in unusual spots than are pergolas or gazebos. They can even be used as sun-blocking curtains for porches or patios. Shade sails can be as small as five feet across or as big as twenty feet. They are a flexible option for extending your outdoor living space and making your deck or patio a pleasant place to relax.