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Fizik Transiro R4 Powerstrap Shoes The Fizik Transiro R4 Powerstrap shoes have been designed to achieve a snug fit. While most Velcro fasteners simply join two sides of the shoe upper, with the Powerstrap configuration a strap goes around the foot ensuring maximum comfort. In this way, the system takes advantage of the Fizik volume control principle, both the forefoot and the midfoot are separately adjustable areas that offer customized grip and compression.