About Us
Father & Son
It all started with a suitcase. One summer, my sister was packing for a trip with her friends, but there was simply no space left for all her shoes. She wanted to bring a pair for every outfit, every occasion, every moment. My father, Yves, looked at the overflowing suitcase and joked: “What if we made a shoe that could be all of them at once?" That joke became an idea, and that idea became a mission.
From that day on, our living room turned into a small design lab. Sketches, prototypes, sleepless nights, and countless trials later, SEYES was born... a shoe system built around one simple truth: you don’t need more, you just need better.
Together with my father, I, León, joined from the very beginning, shaping every detail, from the modular design to the website, from the colors to the story we tell.
SEYES is the world’s first fully modular shoe: made of three interchangeable parts, the sole, the insole, and the upper, that can be swapped in seconds. It lets you travel lighter, create endless looks, and reduce waste, without ever compromising on style or comfort. Every component is crafted in Spain, but designed in Switzerland with sustainable, vegan materials, designed to last and to be replaced individually. Because we believe in slow fashion, in circular design, and in creating products that help the planet breathe a little easier.
What began as a small family idea has grown into a vision for the future of footwear. A vision where less is more, and one sole can become many.
Our sustainable manufacturing...
Sole:
High-performance sole, built to last
The Seyes sole is made from an advanced technical material that combines lightness, flexibility, and durability, delivering long-lasting comfort for everyday wear.
Its structure provides:
- High abrasion resistance → built to last over time
- Natural flexibility → adapts to your foot’s movement
- Reliable grip → stability across different surfaces
- Premium matte finish → clean, versatile aesthetic
More efficient from the start
Our sole is produced using optimized processes that significantly reduce energy consumption compared to traditional manufacturing methods.
👉 Efficient production
👉 Reduced resource use
👉 Cleaner processes
100% recyclable material
The sole has been developed to be fully recyclable, aligning with the Seyes philosophy:
creating products that last longer and generate less waste.
Designed for a modular system
Unlike traditional footwear, the Seyes sole is not meant to be constantly replaced, but to serve as the foundation for multiple styles.
👉 Change the upper, not the entire shoe
👉 Extend the product’s lifespan
👉 Reduce unnecessary consumption
Smart engineering
Behind every sole is precise engineering that allows our modular system to work seamlessly without compromising performance or comfort.
The result:
a balance between innovation, durability, and real sustainability.
Less impact. More use.
As part of a modular system, a single sole can replace multiple pairs of shoes over time.
This means:
- Less overall production
- Less transportation
- Less waste
The foundation of the system
The sole is not just a part of the shoe.
It’s the starting point of a new way of consuming.
One base. Multiple styles. Lower impact.
Insole:
Comfort in every step, engineered responsibly
The Seyes insole is designed to deliver long-lasting comfort, breathability, and support, using advanced materials that combine performance with a more responsible approach.
Advanced materials, lower impact
Our insoles are made using a combination of:
- Biodegradable polyether-based foam
- Certified recycled PET
- Selected natural and recycled components
These materials are carefully chosen to reduce environmental impact while maintaining high performance and durability.
Lightweight comfort that adapts to you
The insole is engineered to provide:
- Soft, cushioned feel → all-day comfort
- Breathable structure → helps keep feet fresh
- Adaptive support → moves naturally with your foot
Efficient production, cleaner processes
The manufacturing process is designed to minimize impact:
👉 Low-energy production
👉 Reduced use of adhesives
👉 Optimized material efficiency
Designed with its lifecycle in mind
The materials used in the insole are developed to be more environmentally considerate, with the potential for biological degradation under specific controlled conditions.
Because sustainability is not just about how a product is made,
but also what happens after its use.
Made for modular use
As part of the Seyes modular system, the insole works together with the sole and upper to extend the life of the entire product.
👉 Replace only what you need
👉 Keep the rest in use
👉 Reduce unnecessary waste
Less waste. More use.
By combining durable materials with a modular design, one Seyes system can replace multiple traditional pairs over time.
Less consumption. More efficiency. Real impact.
Upper:
Crafted by hand, designed to evolve
Every Seyes upper is carefully handcrafted, combining precision, quality, and attention to detail.
Cut, stitched, and shaped by skilled makers, each piece reflects a more thoughtful way of producing footwear.
Responsible materials, premium feel
We use a curated selection of materials that balance performance, comfort, and sustainability:
- Vegan materials
- Certified recycled PET fabrics
- Selected natural textiles
- High-resistance recycled stitching threads
Because premium quality should also mean responsible choices.
Built to last, made to be worn
Each upper is designed for real life:
- Durable construction → made for everyday use
- Flexible fit → adapts comfortably to your foot
- Breathable materials → keeps you feeling fresh
Not just to look good — but to perform over time.
One upper, endless possibilities
The real innovation lies in what happens next.
With Seyes, you can switch uppers in seconds:
👉 Change your style
👉 Adapt to different situations
👉 Create multiple looks from one base
Without buying a new pair every time.
Engineered for modularity
Each upper is precisely designed to integrate with the Seyes system.
Behind the simplicity of swapping styles, there is a carefully developed structure that ensures:
- Secure fit
- Easy interchangeability
- Long-term durability
More than style... a new way to consume
Instead of owning many shoes you rarely use,
you build a system that adapts to you.
Less clutter. More versatility. Lower impact.
Designed to reduce, not replace
By extending the life of each sole and allowing you to refresh your look with a new upper, Seyes helps reduce unnecessary production and waste.
Because the most sustainable product
is the one you don’t need to replace.
This is who we are:
A smarter way forward
Seyes is not just about making better shoes
it’s about rethinking how footwear should be made and used.
By combining modular design, responsible materials, and optimized production, we reduce unnecessary complexity across the entire process.
Our manufacturing approach relies on significantly less machinery than conventional footwear production, up to 75% less in many stages, helping lower energy consumption while maintaining high performance and quality.
Fewer machines. Fewer resources. Less impact.
Less production. More use.
Instead of producing and consuming multiple pairs, Seyes is built around one simple idea:
one system that adapts, evolves, and lasts.
- Replace parts, not the whole product
- Extend the life of every component
- Reduce waste at its source
The future, already in motion
We don’t believe in doing things the same way, just slightly better.
We believe in doing them differently.
Less, but better.
Fewer shoes, more possibilities.
Lower impact, higher value.
That’s Seyes.
Our sustainable certifications
At Seyes, we choose certified, responsible materials that support our modular concept: less waste, fewer resources, and smarter consumption.
First ever sole prototype
This first prototype that marked the start of Seyes. The moment when a simple idea became a movement. A sole that could change whenever and wherever.
Made with LOVE
Where Swiss precision meets Spanish craftsmanship... each pair hand-stitched with dedication and soul.
First ever finished model
The very first finished pair... proof that dreams, ideas, and countless hours can take shape. This is where Seyes truly began.
Supported by...
Supported by certified secure-shipping partners across Switzerland and the European Union, and proudly accredited with Swiss Innovation recognition and membership in the Suisse Start-up Association.