Midsoles don’t get much thinner or firmer, making the Terrafly 277 a true minimalist speedster best suited to roads or packed trails. The underfoot feel is stoutly protective but brutally honest—if you need any kind of pronation control, or prefer a well-cushioned shoe, the Terrafly isn’t for you. But the stiff mesh upper is reassuringly snug. Best for narrower feet. 8.3 oz; 6-mm heel-to-toe drop.