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* {{H:cushioning}}. The Piranha is reasonably well cushioned given its weight of only 4.2oz. There is a lot less cushioning than you'd find even in shoes that most people think of as light weight like the [[Asics Gel Hyper Speed]], but even the Hyper Speed weighs half as much again. The Piranha has just enough cushioning for me to consider it an optimal rather than a minimalist shoe. The lack of cushioning in a minimalist shoe reduces [[Running Economy]], but the Piranha allows me to run with just the same biomechanics as I would in a far more cushioned shoe.
* {{H:drop}}. The Piranha has 4mm of drop, and I didn't have any biomechanical issues. The drop is only 3mm when worn, which is close to zero drop for most people.
* {{H:structure}}. The Piranha uses a single density of foam and has no "arch support" to cause foot problems. The whole hole in the underside is a bit of a stone trap, but it didn't cause me issues.
* {{H:flexibility}}. The Piranha is very flexible due to its thin midsole combined with several gaps in the outsole.
* {{H:outsole}}. The Piranha uses the small, hard plastic lugs over the forefoot that are common in this type of lightweight shoe. These are not trail lugs, but provide great grip on asphalt.