Race belts prevent pinholes in your running gear and allow you to more easily carry food and other small items.
If you think race number belts are just for triathletes, think again. Attaching your bib to a belt gives ultimate flexibility when it comes to adding or removing layers, and it ends awkward pre-race fiddling with pins and eliminates pinholes in clothing.
The T1 Pro Light belt makes up for any negligible weight addition to your kit by being incredibly useful. Sure it holds your number, but you can also order it with 10 elastic gel loops for holding gels, an inhaler (because those things never fit in pockets), running gloves or anything else you need to stash. Race numbers are attached to secure nylon cords equipped with lace locks. The holders are on sliders to accommodate different sized bibs. Even better, the adjustable T1 Pro Light stays put thanks to a polymer grip on the inside of the belt.