Nathan VaporAir 3.0 7L Hydration Pack coats-jackets Shaft measures approximately not_applicable from

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Zoned micro and nano baffle construction maximizes core warmth while keeping arm movement unrestricted

5" inseam hits the sweet spot between coverage and freedom of movement

the KSO ECO is our pick for training

Temp-IQ cooling technology actively helps regulate body temperature as your workload climbs

Nathan VaporAir 3.0 7L Hydration Pack coats-jackets Shaft measures approximately not_applicable fromFor half day efforts and long training runs where you can't afford to slow down, the VaporAir 3. 0 is our go to hydration pack for serious trail runners and ultra distance athletes. Its body mapped, ventilated back panel pulls heat away from your back a real difference maker in Southern summer humidity. High visibility Safety Yellow accents handle low light visibility without a separate vest. 7 liter total capacity carries nutrition, layers, and gear