Why They're CoolHow little does a runner need the heavy exterior material of most road shoes? If these sleek mesh numbers are any indication, very little. » The 21-ounce Swift Vapors practically drifted from their box to the ceiling. But would the less-is-more aesthetic spell instant speed? Yes. » Not only did their lightness inspire me to gun it, they also offered more arch supportit felt as if Nike had inserted a bedroll under my instep. With a firm exterior heel cup and a polyurethane rib cage securing the upper, you won't notice the missing bulk. » The chrome patina lends a nicely hardcore Michael Johnson track vibe.Hmmm . . .Though an air cushion pads your heel, the forefoot cushioning feels a little, er, flat.