AKU Flyrock GTX WS is a women’s fast hiking shoe designed for dynamic movement on trails and active outdoor use. On the official product page, the technical specifications section lists a construction featuring GORE-TEX® Extended Comfort, a Vibram® Flight Traction Lug Megagrip outsole and a high cushion high rebound EVA midsole setup. :contentReference[oaicite:4]{index=4}

The manufacturer also states that the outsole uses Vibram Traction Lug technology to improve traction and grip, while the upper uses textile with welded PU film protection. The shoe is also described as using the AKU Elica Natural Stride System to promote biodynamic efficiency, and the page mentions the AKU Dual Fit System (DFS). :contentReference[oaicite:5]{index=5}

Note: the official product page contains an inconsistency between the product title and the description/specification block, so the details below are reproduced from the visible technical section of the manufacturer’s page and should be double-checked before publishing. :contentReference[oaicite:6]{index=6}

• Brand: AKU
• Model: Flyrock GTX WS
• Model code: 699 - 330
• Color: Light Grey-Violet
• Type: women’s fast hiking shoe
• Upper: Textile + welded PU film
• Upper protection: Welded PU film
• Lining: GORE-TEX® Extended Comfort
• Outsole: Vibram® Flight Traction Lug Megagrip
• Midsole: High cushion high rebound EVA
• Lasting board: 2.0 mm polypropylene + die cut EVA (flexible)
• Footbed: Ortholite® Hybrid partially recycled
• Women’s weight: 300 g (½ pair)
• Women’s size range (UK): 3–9