Armstrong Midlength Mk II X-Form Board

STOCK ARRIVES THIS WEEK 7TH JUNE

Sizes: ML38 / ML45 / ML55 / ML65 / ML75 / ML85 / ML100 / ML115 / ML130

Here is a link to a playlist with all the good videos regarding this board HERE

RED = in demo

Need help? Book in a video call with Nick, and we can help determine if this is the right product for you, help you select the right size, and advise on trading valuations on your current gear. 

Here is a link to a curated playlist with all the good videos regarding this board 

Why Riders Are Choosing the Midlength Mk II

The Midlength Mk II is designed to make every stage of foiling easier and more intuitive.

The refined double concave to subtle V bottom helps generate lift efficiently during takeoff, while the thinner X-Form profile improves responsiveness once on foil. Touch-downs recover faster, the board tracks less when reconnecting with the water, and the surf-style squash tail improves stability during starts and low-speed manoeuvres.

Combined with Armstrong’s proven Forward Geometry foil track system, the result is a board that feels balanced, predictable, and remarkably connected.

Whether you’re progressing in parawing, wing foiling, Foil Drive, or downwind foiling, the Midlength Mk II gives riders the confidence to push further while making the learning process smoother and more enjoyable.

Key Specs

• New X-Form precision molded board technology
• Lighter, stiffer, and more durable construction
• Full high-density PVC wrap construction
• Dual carbon stringer system
• Carbon foil tracks integrated into stringers
• Forward Geometry foil track placement
• Refined thinner profile for improved foil connection
• Double concave to subtle V bottom design
• Surf-style squash tail for stability and early release
• Foil Assist compatible
• Protective board bag included

Why X-Form Matters

The Midlength Mk II isn’t just a new shape. It’s the first board built around Armstrong’s new X-Form Precision Molded Board Technology, developed to solve the durability, consistency, and performance limitations of traditional board construction.

The result is a board that is lighter, stronger, and significantly more resistant to long-term fatigue and softening.

For riders, that means the board you buy today is designed to feel the same hundreds of sessions from now.

The precision molded construction creates a stronger connection between rider and foil, delivering cleaner feedback underfoot, improved responsiveness, and greater confidence when conditions get challenging.

Economically, X-Form represents a significant investment in long-term durability. The full PVC wrapped construction, reinforced rails, integrated carbon foil tracks, and dual carbon stringer system are all designed to withstand years of progression while maintaining the board’s original ride characteristics.

In simple terms:

• More durability
• More consistency
• More confidence
• More value over the life of the board

Because performance means nothing if your gear doesn’t last.

How It Compares

Midlength Mk II vs Traditional Composite Foilboards

Midlength Mk II X-Form

• Significantly stiffer and more durable
• Precision molded for exact consistency
• Thinner profile with improved foil connection
• More resistant to softening and fatigue over time
• Cleaner release and reduced sticking on touch-downs

Traditional Composite Construction

• Softer flex over time
• Less consistent manufacturing tolerances
• Heavier for equivalent stiffness
• More prone to water absorption and fatigue

In simple terms:

• Midlength Mk II = connected, durable, precision performance
• Traditional construction = softer, less direct feel over time

Midlength Mk II Overview

The Armstrong Midlength Mk II introduces Armstrong’s new X-Form precision molded construction technology, delivering a major step forward in board stiffness, durability, and long-term consistency.

Built and refined in New Zealand’s demanding conditions, the Midlength Mk II combines efficient paddling, fast takeoffs, and a highly connected feel on foil with a lighter and stronger overall construction.

The thinner X-Form profile allows the rider to stand closer to the foil, improving responsiveness and reducing unwanted touch-downs. Combined with refined volume distribution and a surf-inspired outline, the result is a board that feels composed, intuitive, and highly predictable across a wide range of conditions.

X-Form Construction Technology

The new X-Form construction was developed to solve long-standing durability and consistency limitations found in traditional board manufacturing.

Key features include:

• CNC-machined precision molds
• Internal CNC-cut structural components
• Full PVC wrapped construction
• Dual carbon stringer system
• Integrated carbon foil tracks
• High-pressure molded layup

This creates a board that is:

• Stronger
• More consistent
• More rigid under load
• More resistant to fatigue over time

Unlike traditional molded boards, the X-Form process locks every component into place under uniform pressure and temperature with minimal distortion.

Shape & On-Water Feel

The Midlength Mk II has been refined to feel:

• Composed
• Responsive
• Predictable

The thinner profile and updated bottom design improve release during touch-downs while maintaining excellent stability during takeoff and paddling.

Key shape updates include:

• Double concave to subtle V bottom shape
• Shallower chines for reduced drag
• Surf-style squash tail for improved stability
• Forward Geometry foil track placement
• Reduced sticking and tracking during touchdowns

The result is a board that accelerates efficiently onto foil while maintaining a highly connected and intuitive feel once flying.

Real-World Performance

From our own testing and feedback:

• Noticeably more connected underfoot
• Faster release during touch-downs
• Improved stiffness and responsiveness
• Stable paddling and early takeoff performance
• Excellent efficiency on mid-length foil setups

The thinner profile creates a much more direct feeling between rider and foil, particularly when carving, pumping, or riding at speed.

Best For

• Mid-length foil setups
• Parawing progression
• Downwind foiling
• Wing foiling
• Efficient paddling and early takeoffs
• Riders prioritising stiffness and durability

Important Notes

The Midlength Mk II is not simply a shape update — it represents a completely new construction platform for Armstrong.

The new X-Form technology delivers significant gains in stiffness, consistency, and long-term durability while maintaining the connected riding feel Armstrong boards are known for.

Riders coming from traditional constructions will immediately notice:

• Improved rigidity
• Cleaner release
• More direct foil feedback
• Increased confidence at speed

Available at Underground Surf and Foil

• New Zealand’s leading Armstrong dealer
• New Zealand’s only official Armstrong demo centre
• Based at Orewa Beach, Auckland

We ride the full Armstrong board range and have demo equipment available. If you’re unsure which Midlength Mk II size suits your setup, we can help guide you toward the right board for your riding.

Talk to Us

Get in touch or book a demo to experience the Armstrong Midlength Mk II X-Form Board for yourself.