Upgraded MBS??? belt reduces pack bounce. Contoured shape for great fit and adjustment points on both sides for one size fits most athletes. Perfect for road running crowd or for trail racing where aid stations are more plentiful. Race belts are cooler because they cover less surface area of the body, keep weight lower for better balance and are easy and fast to get on and off. The center front pocket is large enough for cell phone or energy foods with tuck away jacket straps perfect for extra clothing or Z-poles.