AFS UHM Skinny Carbon Mast

The AFS UHM Skinny Carbon Mast takes everything the standard UHM delivers and strips away the last remaining drag. The Skinny's radical thin-chord, reduced-thickness profile — the narrowest in the AFS range — cuts through the water with less resistance than any other AFS mast, while the same Ultra High Modulus carbon construction maintains the zero-compromise stiffness of the standard UHM. This is the mast for riders who have mastered foil technique and are now hunting purely for speed, glide, and efficiency.

Available in 80cm and 85cm, the UHM Skinny fits high-performance AFS foils setups where drag reduction and high-speed glide are the priority. One experienced rider who completed 2,000 miles on a 75cm Skinny described it as providing "the longest glides of my life" alongside higher average speeds and lower heart rates — a real-world endorsement of what reduced drag actually does in practice.

Who It's For

The UHM Skinny is a mast for expert riders: experienced wingfoilers pushing consistently high speeds, downwinders chasing personal bests on long ocean runs, and riders with high-aspect foils (900mm+ wingspan) where the mast's thinner chord has a measurable impact on roll characteristics and manoeuvrability. The Skinny's ultra-thin profile is particularly effective paired with wider span foils — the reduced chord length at the mast-fuselage junction improves the roll aspect significantly on high-AR wings. It is not a learning mast or even a general performance mast — the UHM Skinny demands excellent technique, and its live, expressive feel amplifies every carving input.

Key Features

• UHM (Ultra High Modulus) carbon — same grade as the standard UHM, maximum stiffness
• Ultra-thin chord and reduced thickness profile: the narrowest, lowest-drag mast in the AFS range
• 12.8mm thickness (75cm) — one of the thinnest foil masts available
• 100mm chord — among the shortest on the market, optimising roll on high-AR foils
• Measurably reduced drag at speed compared to standard UHM
• Available in 80cm and 85cm
• Full Fuselink compatibility: Fuselink base to fuselage, standard top to board
• Particularly effective with foil wingspans above 900mm
• Rider-reported performance gains: higher average speeds, better glide, reduced effort

On the Foil

The Skinny has a distinct personality. The reduced chord makes it feel looser and more dynamic than the standard UHM — experienced riders describe it as "wild, expressive, amplifying every carve." That's not a handling flaw; it's the natural result of less lateral area in the mast. At speed, the reduction in drag is perceptible rather than marginal: less drag means you hold foil height longer between pumps, you reach higher top speeds, and you recover swell energy more efficiently on downwind runs. For riders with efficient technique, this translates directly into lower effort for the same performance. The caveat: the Skinny is less stable than the standard UHM in the lateral plane, so early-stage technique issues will feel more pronounced. Ride it when you're ready for it and it is genuinely transformative.

Compatibility & Setup

The AFS UHM Skinny Carbon Mast uses the Fuselink system — AFS's proprietary conical mast-to-fuselage connection, fastened by two M8 screws. The Fuselink base is compatible with all current AFS Fuselink fuselages. The top plate mounts via a standard US double-rail box plate or AFS board box. Fuselink is not compatible with Tuttle, Deep Power, or other proprietary connections without an adapter. Note that the Skinny's short 100mm chord may affect how the mast sits in the fuselage connection — check with us if you're combining it with a non-standard AFS fuselage configuration. As with the standard UHM, older AFS Performer fuselage users will require the AFS Switch Fuselage for use with current wing ranges.

Construction

The UHM Skinny uses the same Ultra High Modulus carbon fibre as the standard UHM — the same stiffness, the same layup philosophy — in a redesigned, thinner cross-section. Where the standard UHM prioritises stiffness through profile depth, the Skinny achieves the same structural performance with a narrower chord and reduced thickness by relying on the UHM fibre's exceptional stiffness-to-weight properties. The result is a mast that is simultaneously stiffer-feeling (due to its reduced chord, which distributes flex differently) and faster (due to its reduced wetted area). The manufacturing precision required for the Skinny is higher than for the standard UHM — tolerances are tighter and the reduced material cross-section leaves less margin for error. AFS produces this mast to exacting quality standards to ensure consistency across the range.

Spec Table

Pairs Well With

The UHM Skinny performs best at the sharp end of a performance build. Browse the full AFS range, mount it to a fast wing foil board, and complete the setup with a high-aspect wing foil foil package.

Why We Stock It

The UHM Skinny is the kind of product that gets dismissed as marginal until you ride it — and then it's impossible to go back. We stock it because we've seen the data: riders who move from the standard UHM to the Skinny notice the difference in speed and glide almost immediately. For the right rider, it's not just an upgrade — it's the best possible mast for high-performance foiling in the AFS range.

FAQs

What makes the AFS UHM Skinny different from the standard UHM?

Both use Ultra High Modulus carbon for maximum stiffness, but the Skinny has a thinner chord and reduced profile thickness — the narrowest in the AFS range. The shorter chord (approximately 100mm) and thinner cross-section reduce hydrodynamic drag at speed, resulting in better glide, higher top-end speed, and less rider effort to maintain foil height. The trade-off is a slightly more dynamic, expressive feel that rewards clean technique.

Is the UHM Skinny suitable for beginners or intermediate riders?

No. The UHM Skinny is for expert riders with well-established foil technique. Its ultra-thin profile feels more reactive and less stable laterally than the standard UHM — which is a genuine performance benefit when your technique is dialled, but can feel demanding or unstable if you're still developing. We recommend the HR or HM for progression-stage riding.

What disciplines does the UHM Skinny suit?

The UHM Skinny is most at home in wing foiling and downwinding at performance level, and it excels with high-aspect foils (900mm+ wingspan) where the shorter chord noticeably improves roll characteristics. It's also used by race-adjacent riders who want the speed benefits of a Skinny profile without the full race-spec Race mast. It suits surf foiling in cleaner conditions where the looser feel is an asset.

How does the Skinny's chord length affect handling?

A shorter chord reduces the mast's lateral area, which lowers drag but also reduces lateral stability. This makes the mast feel more dynamic and expressive in carves — smaller inputs produce larger foil responses. For high-AR foil setups, the shorter chord also meaningfully improves roll aspect by reducing the moment arm at the mast-fuselage junction. It's a genuine performance advantage when paired with the right foil.

Is the UHM Skinny compatible with my AFS fuselage and board?

The UHM Skinny uses the Fuselink connection — compatible with all current AFS Fuselink fuselages. The top plate fits standard US double-rail box boards or AFS board boxes. Not compatible with Tuttle, Deep Power, or other proprietary box connections without an adapter. If you have an older AFS Performer fuselage, the AFS Switch Fuselage is required.

How does the UHM Skinny compare to the standard UHM in terms of stiffness?

Both use the same UHM carbon grade, so the raw material stiffness is identical. In practice, the Skinny can feel stiffer in the lateral plane due to the reduced chord distributing load differently — but it's the drag reduction, not stiffness difference, that is the primary performance gain over the standard UHM. For maximum torsional stiffness in longer lengths, the standard UHM's wider profile may have an advantage.