The Chinook Sailing Power Glide Sail was designed by David Ezzy of Ezzy Sails using the same quality materials he uses in his high-end wave and slalom sails. PowerGlides are light, responsive, and durable. The PowerGlide range changes as area increases. The 3.0 and 3.5 are shaped around smaller sailors or kids. Starting at 4.0 as square meters increase, the focus changes to powerful, early planning models.