It is essential that the upper can breathe to keep feet warm inside mountain footwear.

AIR8000® is the first of two systems that AKU has created to ensure the footwear has a high level of breathability. It consists of a specially made fabric whose level of breathability increases over a period of 24 hours up to more than 11 times that of a conventionally made fabric.


With the AIR INFINITY upper, AKU’s research on breathability is clearly shown in the cutting-edge constructional technique. In this case the upper is made using a layered system consisting of:

– a base in microfiber, a material that is already 30% lighter and more breathable than leather but has been worked, using a perforation process, to make it even more lightweight and more breathable
– a non-run 3-D woven fabric that enhances the features of lightness and breathability. These 2 layers are joined together with a spot bonding process that guarantees light weight and breathability because large areas for ventilation are left free.

Superalp NBK GTX
Trekker Lite III GTX
Slope GTX
Selvatica Mid GTX
Trekker Lite III GTX Ws
Selvatica Mid GTX Ws
Alterra GTX
Tengu Low GTX
Trekker Pro GTX
Alterra GTX Ws

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