If you're racing in cold weather, you'll probably want a pair of running trousers to wear before and after the race, even if you strip down to shorts for the race. Underneath your top layers, consider a lightweight, long-sleeved running top with running bottoms of your choice—shorts, trousers or leggings. For warmer-weather races, opt for a pair of running shorts in a breathable, sweat-wicking fabric. Pair your running bottoms with a Nike Dri-FIT training tank or tee and a pair of Nike road racing shoes.