Avoid New Shoes1 of 6
Train in your race day shoes for at least two weeks (a month is ideal) before the big day in order to avoid break-in blisters. Running shoes should be replaced every 300 to 500 miles, so if your kicks are approaching mile 299, you won't want to race with them, either. Make sure your shoes fit well and are comfortable.
Know the Time of Day2 of 6
If you'll be running in the early morning or evening, consider clothing with reflective details. You may also need a headlamp, like Petzl's Tikka Plus 2, which weighs a light 2.9 oz. If your race is during regular daylight hours, you might want lightweight sunglasses with non-slip silicone at the bridge, like Smith Approach Max; a moisture-wicking hat; and a breathable tee that features built-in sun protection.
Skip Cotton3 of 6
Cotton can become wet from sweat and, because it doesn't dry quickly, can make you cold. It can also cause chafing. Stick to technical fabrics, which are breathable and moisture-wicking, so you stay dry.
Dress for the Weather4 of 6
You'll heat up as you run, but if you're starting early, you may want to wear a long-sleeve sweat-wicking shirt or capri tights. If you know you'll be warm, sport a lightweight pair of shorts and a tank or tee. If it's raining, a light, waterproof shell will protect you from the wind and rain.
Go the Distance5 of 6
Hydration is key for long-distance runs or in humid climates. Wear a hydration belt to carry water and some gels to avoid dehydration or heat illness. Fitletic's version holds two bottles for 12 oz. of water and features a zippered pouch for fuel.