Evaluation Whether you choose the Flyroc or the Terroc will probably simply come down to weight. There’s little to choose between the shoes' features – both have the same midsole and are built on the same last.
The Flyroc feels slightly more performance oriented by dint of its lighter, more breathable upper and marginally more aggressive outsole. While the Terroc feels like a trail trainer, the Flyroc seems more suited to longer off-road racing and better equipped to deal with variations in traction underfoot.
In short Like the two Mudrocs, there’s little to choose between the Flyroc and the slightly heavier Terroc. The Terroc feels more supportive, but the Flyroc slightly more responsive.