Sustainability

Every carbon hydrofoil has a footprint. This page is our honest accounting of ours. Specific numbers, peer-reviewed sources, and a clear list of what we aren't claiming. Transparency is the only way a non-profit subscription model earns the right to say it's better than the alternative.

FoilHive makes and rents foil components: front wings, tail wings, masts, and fuselages. We don't make boards. Most of our subscribers already own one.

Where the gear is made

Unlike most hydrofoil brands, which prototype and manufacture in China and ship finished goods in container lots to Europe, everything we sell is designed, prototyped, tested, built, and repaired in Tarifa, Spain, by our sister brand ONIX Foils. Same team. Same workshop.

That local concentration matters for three reasons:

  • Prototypes don't cross oceans. Design iterations happen in-house, without the back-and-forth freight of an offshore supply chain.
  • Every wing is tested on the water by the team that designed it, in Tarifa's real conditions, before it reaches a subscriber.
  • Repairs happen by the people who built the gear, in the same workshop, with the same tools and materials.

The carbon maths of one wing

One complete FoilHive setup (front wing + tail wing + mast + fuselage + hardware) weighs approximately 5 kg. A single carbon front wing accounts for roughly 1.5 kg of that weight.

Producing one kilogram of finished carbon fibre generates between 13 and 34 kg of CO2-equivalent emissions, depending almost entirely on the electricity grid that powers production (Prenzel et al., "Bringing Light into the Dark: Overview of Environmental Impacts of Carbon Fiber Production," Polymers 16(1):12, 2024). The study's worst-case scenario, a coal-heavy grid like China's current electricity mix, sits at the top of that range, around 34 kg CO2e per kg. A generic European grid mix is around 29 kg. A renewable-heavy grid brings it down toward 13 kg CO2e per kg.

Our curing happens in Tarifa, Spain, on a grid fed heavily by local wind generation. Tarifa has been a centre of Spanish wind energy since the 1980s: the El Cabrito wind farm on the Strait of Gibraltar, inaugurated in 1995, is one of Spain's oldest commercial wind farms, and the Cádiz coast around it has stayed dense with wind farms ever since. Today the province has roughly 1.4 GW of wind installed across around 70 wind farms, about 40% of all the wind power capacity in Andalusia (source: COPE, June 2025). Across Spain, renewables supplied 55.5% of electricity generation in 2025, with wind the single largest source at roughly 21.6% (source: Red Eléctrica de España, Spanish Renewable Energies Report, 2025). That puts our production baseline near the lower end of the range.

In concrete terms, the carbon fibre in one FoilHive front wing accounts for roughly 20 to 25 kg CO2e to produce on Spain's renewable-leaning grid. The same part cured on a coal-heavy grid would carry closer to 50 kg CO2e. So our production footprint is, credibly, around half the industry norm for the same finished part. These are rounded estimates: a front wing is a carbon layup over a wooden core, so not all of its 1.5 kg is carbon fibre, and we would rather state the method than imply false precision.

The honest picture on shipping

It would be easy to claim that shipping from Tarifa beats shipping from China, but the numbers don't fully support that, and this page is about honest accounting. A 5 kg kit travels roughly 1,900 km from Tarifa to Paris, mostly by road; the same kit from Shenzhen covers roughly 20,000 km, almost always by container ship. Container shipping is remarkably carbon-efficient per tonne-kilometre, so the two routes are closer than intuition suggests.

Here is why. What matters is not distance alone but distance multiplied by how efficient the transport is, and a container ship is far more efficient per tonne-kilometre than a truck. A container ship moves freight at roughly 8 to 16 g CO2e per tonne-kilometre; a truck, depending on how well it is loaded, runs from about 57 g for a full long-haul trailer to over 140 g for a fleet average that includes empty return legs. The ship is five to fifteen times more efficient per kilometre, which roughly cancels out the China route being about ten times longer.

Run the numbers on a 5 kg kit and the two routes overlap:

  • Tarifa to Paris, mostly by road (~1,900 km): roughly 0.5 to 1.3 kg CO2e per kit, depending on how well-loaded the truck is.
  • Shenzhen to Paris, by container ship (~20,000 km) plus the port-to-Paris road leg: roughly 1 to 1.8 kg CO2e per kit.
  • Shenzhen to Paris with partial air freight: easily 10 kg CO2e per kit or more.

So on transport carbon alone, sea freight from China and road freight from Tarifa land in the same range. Neither is a decisive winner, and we are not going to pretend otherwise. Where the Tarifa model genuinely wins is everywhere else: the manufacturing grid is far cleaner, with Spain's electricity averaging around 108 g CO2 per kWh in 2024 against roughly 565 g for China's grid (IEA; Electricity Maps); there is no air-freight exposure for urgent restocks; and there is no back-and-forth prototype freight, because design, testing and repair all happen in one workshop.

The waste built into mass production

The deeper problem with the offshore model isn't any single shipment. It's that production at scale answers to a forecast, not to what riders in front of you actually need, and the gap between the two is waste.

The COVID years are the clearest example. When demand spiked, supply chains seized up, so brands and retailers over-ordered to protect themselves, hoping enough of it would arrive. Then it all landed at once, just as demand cooled. The action-sports trade was left deeply over-inventoried, and the only way to move the stock was to discount it: 40 to 70 percent off became normal across the surf and watersports industry through 2022 and 2023 (Shop Eat Surf Outdoor).

The bicycle industry is the textbook case. COVID demand drove offshore factories to scale up on the assumption it would last; it didn't, and with no shared visibility between makers and real end-demand, the industry spent years on below-cost fire sales, collapsed margins and retailer bankruptcies. Shimano's operating profit fell to its lowest level since 2013 (Sporting Goods Intelligence Europe).

A small fleet, built and held where it's actually ridden, doesn't have that failure mode. We add capacity when the community grows, not when a forecast says it might. That is the point of building the fleet in Tarifa instead of ordering a container of wings in advance.

The circular maths of a subscription

The single biggest lever in a subscription model is amortisation of the production footprint across multiple riders and multiple seasons.

A traditional retail cycle looks like this: one rider buys a new wing, rides it for 1 to 2 seasons, resells it or puts it in a corner, and buys the next size up or a different family. The production footprint of that wing counts against one rider.

A subscription model looks like this: one wing joins the fleet, is ridden by Rider A for a few months, cycles back to Tarifa for inspection and light refurb, goes out to Rider B, cycles back, goes out to Rider C, and so on. A single wing serves many riders across its service life.

Our target for each front wing in the FoilHive fleet is 10 or more riders across its lifetime, enabled by a repair-first workshop philosophy rather than a replace-first one. At that target:

  • Per-rider share of production footprint: roughly 2 to 2.5 kg CO2e across the full period a rider uses the wing.
  • Comparable retail ownership share: roughly 25 to 50 kg CO2e per rider over the same usage, depending on where the competitor wing was manufactured and how long each owner kept it.

That is roughly a 90 percent reduction in embodied production carbon per rider, before we count the shipping savings and the absence of resale-and-rebuy depreciation waste. To be clear about the method: this is our own estimate, not a third-party audited figure. It divides the per-wing production footprint (around 20 to 25 kg CO2e) across our target of 10+ riders, and compares it to a competitor wing serving one or two owners over the same period. The 10+ riders figure is a target, not yet measured data, our fleet is too new, and we have committed to publishing the actual per-component service life as return data comes in.

Our repair philosophy

Every piece of gear returned to Tarifa is inspected on arrival:

  1. Visual and structural inspection, edges, layup integrity, mast straightness, fuselage corrosion, hardware condition.
  2. Cleaning and light refurbishment, salt flush, UV-damaged surfaces treated, hardware replaced if needed.
  3. Repair decision, scratches, small dings, and cosmetic wear are repaired in-house. Structural damage (cracked carbon core, delamination, bent mast beyond tolerance) triggers retirement.
  4. Re-issue or retirement, repaired items rejoin the fleet. Retired items are stripped for salvageable hardware, fuselage components, and masts where possible.

We repair almost everything. Most brands can't, and it isn't because they don't care. A structural carbon repair is closer to aerospace work than to a bike-shop tune-up: it needs trained technicians, controlled curing, and specialised equipment, and done badly it fails. When the people who built the gear are on another continent, the round-trip freight and the scarcity of qualified composite repairers routinely cost more than a new unit. So the offshore model defaults to replacement: brand warranties cover manufacturing defects with a new product, everyday impact damage falls on the owner, and damaged gear is, in practice, discarded rather than rebuilt.

That matters, because carbon-fibre composite barely breaks down. In landfill it loses roughly one percent of its mass in a century, and incinerating a tonne of it releases up to around two tonnes of CO2 (Frontiers in Materials, 2024). Recycling methods exist but are still developing and not yet available at consumer scale. Our Tarifa workshop, staffed by the same people who designed the gear, is where that equation flips: repair is the default, not the exception.

We don't have a year of return data yet. Our fleet is new. We commit to publishing quarterly figures on repair rates, retirement rates, and per-component service life as volume comes through, starting with the first full quarter of return data.

What a non-profit structure actually means

FoilHive is a Belgian VZW (Vereniging zonder winstoogmerk, non-profit association), registered as KBO-BCE 1035.828.653 on 25 March 2026. There are no shareholders, no dividends, and no profit extraction. Every euro from subscriptions is reinvested into one of five categories:

  • Gear fleet expansion and replacement
  • Tarifa workshop, inspection, and repair operations
  • Subscription price accessibility 
  • Community initiatives (local watersports events, education, beach cleanups)
  • Ocean Cleanup donations

We will publish an annual financial summary once the first boekjaar closes (1 November 2026). Until then, if you want to see the numbers before subscribing, email us and we'll send the working figures.

What we are not claiming

A few things we won't claim because we can't defend them at our current scale:

  • Carbon neutral. We aren't. Carbon production has a real, non-zero footprint and no accounting trick erases that. Our aim is meaningful reduction, measured, not net zero on paper.
  • Fully recyclable. Commercial carbon composite recycling is a developing field (see the recycling technology review: Pimenta and Pinho, Waste Management 31(2), 378-392, 2011). At end-of-life, we strip salvageable metal and hardware; the carbon layup itself goes to licensed composite disposal until a viable commercial recycling route exists. We're tracking the field.
  • The most sustainable option. Renting for a weekend at a foil school is less gear-intensive than subscribing for a year. Not foiling at all is less gear-intensive still. For riders who have decided to ride, subscription lowers the footprint versus owning. It isn't zero.

How subscribers lower their own footprint further

  • Use FoilCare. Small scratches are covered by your subscription. Don't rush to swap a wing for cosmetic wear; the repair cycle handles it.
  • Return gear in its original packaging. You earn Hive Credits for doing it, and we reuse the packaging for outbound shipments.
  • Travel with your FoilHive gear to destinations within range instead of shipping a new kit to a holiday spot. Gear you already have beats new gear in transit.
  • Collect a bag of trash at your local spot. It earns Hive Credits you can redeem as a donation to The Ocean Cleanup.

Third-party validation (in progress)

Credible sustainability claims need independent verification. We are working toward:

  • A third-party lifecycle assessment (ISO 14040 / 14044) of one complete FoilHive setup. Target: completion within the first 18 months of public operation.
  • Annual VZW compliance filings with the Belgian Staatsblad (automatic, legally required). These are public record at KBO-BCE 1035.828.653.
  • Third-party watersports sustainability recognition (World Sailing 11th Hour Sustainability Award or equivalent). We'll apply once the first year of data is available.

Until those are in place, every number on this page is sourced above to peer-reviewed literature or verifiable industry data. If you want to see our working calculations or methodology, email us.

Questions

How do you know your repair rate will match the target?

We don't yet. Our fleet is new. Our target of 10 or more riders per wing is set based on the workshop capacity and the repair philosophy of the team that builds the gear, not from past data. We commit to quarterly publication of actual figures once volume allows, even if those figures fall short of the target.

Is carbon fibre really sustainable?

Not inherently. Carbon fibre production is energy-intensive (13 to 34 kg CO2e per kg depending on the grid, at the high end on a coal grid) and end-of-life options remain limited versus aluminium or wood. Our approach: use carbon only where performance demands it (front wings and tail wings, where stiffness-to-weight is critical), use 6061 aluminium elsewhere (masts, fuselages, hardware), and extend service life via repair rather than replacement.

Why not use bio-resins or flax fibre?

We've tested both. Bio-epoxy resins are viable and we're evaluating them for 2027 production runs. Flax and basalt fibre composites have promising flex-to-weight figures but have not matched carbon stiffness at the thicknesses we need for foil wings. When performance parity arrives at our sizes, we'll adopt.

Where does your raw carbon fibre come from?

Raw carbon fibre is sourced from the established producers in Japan, South Korea, and occasionally China, because that's where global carbon fibre manufacturing is concentrated. But every step after raw material (pre-preg sheeting, layup, curing, finishing, QC) happens in Tarifa. We don't claim to eliminate the raw material footprint. We do claim to eliminate the finished-goods freight, the prototype-iteration freight, and the high-carbon grid exposure that comes with Asian final production.

Can I see your annual sustainability report?

Yes, once it's written. Our first annual summary will be published after 1 November 2026 (end of our first boekjaar). Until then, email us and we'll send the current working numbers with sources.

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