It's not even a question you're racing no matter what, and you're running in Ultimate Direction's To Race 3. 0 Hydration Vest. Soft and flexible mono mesh makes this harness extremely comfortable to run in, especially when it's hot and sunny out. Ultimate Direction included two compressible water bottles that tuck away for compact storage when you finish them. The bottle holsters tighten to accommodate smartphones, race information, or energy gels, and there are layered back pockets for ultralight rain jackets and more. The To Race Vest also features a unique trekking pole carry for trail runs.