The Fabric used is HDPE (High Density Polyethylene). This is especially manufactured with Tensioned Fabric Sails in mind. The knit is constructed of both monofilament and ribbon tape filler. The Fabric is treated with UV stabilizers to give it long life in direct sunlight. We do not like to use Monofilament only Shade Fabric for the simple reason that having no Ribbon Tape Filler means that the ability of the Fabric to block the Sun is reduced. To prove this point, we have a small Monofilament only Shade Sail installed in the Carpark at our Factory and I can assure you that it doesn't block the Sun, in fact it barely even casts a shadow. Right next to it we have a Sail made from our preferred Fabric which is in complete contrast, doing an effective job of supplying shade.
We only use Fabric with a UVB rating of 90% and above. Depending on colour, the rating may be as high as 99%. The average rating is 94%.