If you're all about achieving the fastest time possible, this shoe from Under Armour might be your go-to footwear. At 9 ounces, it's just as light as the Charged Bandit 4 and foregoes any unnecessary bulk. Expect lots of breathability as well as flexibility. Although the shoe has a minimalist design, it does have lots of handy features. For example, Micro G foam in the midsole lets you enjoy a very high degree of responsiveness. Other features include an EVA sockliner to reduce slipping and reflective details to keep you safe during night runs.