KETOS FORTRESS UHM Mast A “reinforced concrete” mast built for Pumping (dock start), Wingfoil, and Kitefoil

FORTRESS Mast – Precision Meets Power

The FORTRESS mast is a sleek 13.5 mm profile that delivers an incredible stiffness-to-glide ratio. On our test bench, it clearly outperforms the top-tier masts from leading brands in both flexion and torsion.

Designed for large-span wings like the 155LR, it was developed to meet the demands of heavier riders—such as Patrick, a rider from Lake Annecy.

A mast that’s both rigid and responsive, with a generous chord and a refined lower section measuring just 13.5 mm.

Premium construction:

• Full prepreg carbon with integrated stringer
• High-performance UHM fabrics
• Klever Modular connection system (also available for Axis fuselages)

We recommend pairing it with aluminum/carbon fuselages for optimal performance.

Design & Profile:

• Shaped and designed by Ketos
• Unique Ketos profile, also featured on the Kulan, our thinnest mast at 11.6 mm

Materials:

• Ketos Core
• Prepreg carbon

Manufacturing:

• Molded in a 125T aluminum press
• Production site: KETOS Factory, Aix-les-Bains, Savoie, French Alps

Material sourcing:

• Carbon: France or Italy
• Ketos Core: France or Spain

Energy usage: 100% from green or nuclear sources

Local commitment:

• Over 90% of our revenue comes from products made in our KETOS Factory
• Less than 1% comes from products manufactured in Asia

Recommended disciplines:

• Flat: 80%
• Downwind (DW): 80%
• Wave: 80%
• Pumping, Wing, DW