You've put in endless hours and countless miles of training, and now it's finally time for the main event. When you step to the line of your next ultra-race you'll be glad you've got the Nathan VaporHowe 4L 2. 0 Hydration Vest along for the ride, keeping you hydrated and well prepared for anything the race throws your way. Offering an apparel-like fit that gives you ample storage without adding a bulky or bouncy feel, this vest will store everything from mid-race nutrition to any packable layers and clothing items you might need along the way. And, most importantly, it gives you all the hydration you need for those long miles spent grinding it out over long hills and often rugged terrain. Two 20oz flasks come equipped with the vest, and feature extended tubes to help you drink easily without having to remove them from their pockets. You've also got the option to bring along a 1. 5L reservoir of your own in the back compartment for runs when you'll be far from an aid station for long stretches.