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You've done your best to prepare for the miles that lie ahead, but you'll still need the necessary fuel and hydration to carry you through to the finish line, and that's where the Ultimate Direction Race 4. 0 Hydration Vest comes in. Designed for the demands of race day, this vest implements a simple design that carries just the essentials--two water bottles, energy snacks, and those few extra items you've learned through experience are essential to finishing strong.