M ULTRA FASTPACK IV MID FUTURELIGHT TNF BLACK/FIERY RED
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The Ultra Fastpack IV Mid has been updated with FUTURELIGHT™ and our FastFoam™ midsole system so you can cover more miles, faster, and with more comfort.
Approx Weight (½ pair):
15 oz (426 g)
OUR MOST ADVANCED BREATHABLE-WATERPROOF TECHNOLOGY.
At the heart of Athlete Tested. Expedition Proven.™ is the philosophy that authentic athlete insights push our design and engineering teams to propel our products forward. Our FUTURELIGHT™ technology is no different.
For the first time ever, we’ve added air permeability to a waterproof membrane. The nano structure of the FUTURELIGHT™ membrane allows air to pass through for better venting and breathability without sacrificing waterproofness and durability.
This new nano-fiber structure enabled us to create our most lightweight, breathable membrane to date. An ultra-thin, nimble garment that feels comfortable and provides the protection needed against the elements in the harshest environments.
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