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AKU NS 564 Spider Boot

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The Navy Seal Spider is built around a technical last to provide a superb sensitive feel making it perfect for rapid movements over a variety of terrain.  The uppers are made from AKU’s incredibly breathable Air8000 fabric which offers 11 times the breathability of normal fabric boots.  The lower section of the uppers are protected by a tough ByCast rand which is basically a PU coated split leather.

The midsole is the really clever bit about the Navy Seal, it is AKU’s IMS 3D midsole which cradles the foot in a natural position reduce fatigue and stress injuries.  The IMS midsole features a layer of EVA cushioning above the midsole and directly in contact with your feet.  This EVA layer provides instant comfort and reduces foot movement within the boot.  The Navy Seal is a very low profile boot with a Vibram SWOT outsole, and due to this configuration it is not suited for use with a heavy pack or for extended duties.


  • Weight: 480g
  • Upper: Suede/Air 8000
  • Lining: Sanifit
  • Outsole: Vibram Swot with updated TOE RAND
  • Construction: Cemented Microporosa midsole/rubber sole
  • Lasting board stiffness: Soft
  • Lasting board: IMS 4.2mm nylon + microporosa
  • Upper protection: Bycast rand
  • Upper thickness: 1.6mm
  • Weight: 1060 grams (pair size UK8)



IMS is designed to reduce the risk of injury and increase stability when load carrying.

IMS uses an anatomically shaped 3D midsole that mimics the natural foot shape. Conventional midsoles are flat and offer no structural support to the foot, only dictating the stiffness of the boot. With an IMS 3D midsole the foot is cradled in a relaxed position therefore reducing fatigue and minimising slippage.

Above the IMS midsole is a 3mm layer of high density EVA. This protects the user from loading forces particularly when carrying heavy packs. It also provides a layer of protective support for foot rather than it resting on a hard material.

Below the IMS midsole is a thicker layer of 5mm (under the forefoot) and 17mm (under the heel) high density EVA which absorbs impact forces from the ground.

IMS 3D anatomical midsoles remove the need to “upgrade” boots with off the shelf supports and insoles.

AIR 8000

A high wicking lining fabric is laminated to the tough 3D woven nylon face fabric using a net glue. Traditional manufacturing uses a complete layer of glue to stick the lining to the outer greatly reducing breathability. Net glue uses small blobs of glue in a matrix, full of holes like a net, to ensure maximum breathability and structural integrity.

The face fabric is a tough 3D woven nylon. Constructed with a raised and increased surface area providing far greater abrasion resistance.

The combination of these technologies allows the Pilgrim DS to breathe 11 times better than any of its competitors, and the Pilgrim GTX to have 30% more breathability than conventional Gore-Tex lined boots


The Navy Seal have a Vibram SWOT outsole that makes them great for scrambling as well due to the sole’s edging capabilities and a flat area at the toe for toe point climbing. 

Sizing Guide

We create our footwear using lasts based on real feet. Because of this it is very easy to find your perfect boot or shoe size. 

1st. Step onto a piece of paper and mark just behind you heel and in front of your longest toe.

2nd. Do this for both feet and then measure the centimeters between these lines. This measurement is your Mondopoint.

3rd. Using the measurement from your longest foot find your correlating size below. 

 AKU Footwear Size Guide

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