Nathan Mercury 3 (900 ml) 
This comfortable, versatile and bouncefree three-flask belt is an great option for marathon training and longer road runs.
Features & Benefits
- Ergo-shaped breathable wall mesh and air mesh center with monofilament elastic for multi-directional stretch
- Three 300 ml Flasks with Push-Pull caps
- Stretch mesh zip pocket fits up to an iPhone 8
- Reflective trims
Size: OSFM 26” – 44” (66 cm – 112 cm)