Clocking in at just 6.2 ounces, the Puma Faas 250 ($85) aims to increase your speed. Designed for short, fast runs the upper is breathable mesh to increase the barefoot sensation. The sole does provide some support, but only where designers thought it was biomechanically appropriate. For a little more structure take a half step up to the Faas 300.
Faas 250 by Puma