Improve your stride and performance overall.
Just as your grip is far less exact in a mitten than in a glove, so is your gait less sensitive when your toes are squished together in a thick sock. With that in mind, these toe socks keep your digits separated, which protects them from blistering during a run. Injinji makes a full line of toe socks in varying weights; the performance series is made of a durable wicking nylon. About $14 a pair at REI and other sporting goods stores; order direct from www.injinji.com.