The story behind the sandal
The
Cascade
Protalus · Pacific Northwest
A sandal built because our customers asked for one — and wouldn't wait. The geometry that changed how they walked in boots, carried into summer.
Origin
How it started
They asked for it.
Some of them built it themselves.
Our customers come from every part of life — nurses, warehouse workers, teachers, retirees, students, people in their twenties whose bodies are accumulating damage they cannot yet feel, people in their sixties who feel it on every step. What they share is not an occupation or an age. It is the ground they stand on. The same flat surface. The same missing geometry. The same body trying to compensate.
Many of them had a problem every summer. The geometry that had changed how their bodies felt was locked inside a shoe. In sandals, in the heat, on weekends, on retirement mornings with nowhere to be — it was gone.
Some of them solved this the only way available to them. They taped their Landing Gear to the footbeds of their existing sandals. Duck tape. Adhesive strips. Whatever worked. It was not elegant. It held long enough to confirm something important: they wanted the geometry badly enough to improvise their own version of it.
That is not a market research finding. That is a product brief. We listened.
The Cascade has been available since 2025. This is the first time we have told its story in full.
The design decisions
We had never made
a sandal. Every decision
was deliberate.
This was Protalus's first footwear product. We had no footwear design experience. The risks were real and we did not pretend otherwise. Each decision below was made to manage one of them.
The silhouette
We chose a two-strap silhouette recognisable to anyone who has worn a Birkenstock. Not imitation — calculation. A familiar form reduces the barrier to wearing something new. Our customers had asked for something that blended in. This did.
Unisex from the start
A first footwear product from a company with no footwear history carries real launch risk. Making it unisex — one silhouette, one inventory, one launch — cut that risk in half without compromising the product. The two-strap form worked equally for men and women.
Two adjustable straps
Duck tape worked. Barely. A sandal carrying geometry needs to stay on the foot with precision — the footbed only works when the foot is correctly positioned on it. Two independently adjustable buckle straps solved this. Not a style choice. A functional requirement.
The footbed material
The footbed is made from the same polyurethane used in our Landing Gear — the same material as professional anti-fatigue mats. This was not a cost decision. It was the correct material for what the footbed needed to do, and the only material we trusted to carry the geometry.
The footbed
The same geometry.
Built for open air.
The geometry is visible in the walls of the footbed
The Cascade footbed is modelled directly on the M-100 — our maximum-wall Landing Gear. The geometry that guides the subtalar joint through its correct rotational arc is present in the footbed walls. You can see it. The contour lines pressed into the surface are not decorative — they follow the same oblique angles that make the M-100 clinically effective.
A sandal cannot carry the geometry as completely as a closed shoe or boot. The walls that house the proprietary geometry in our M-series products cannot exist to the same extent in an open footbed. We are honest about this. The Cascade delivers what a sandal physically can. For most wearers, in most summer conditions, that is considerably more than any other sandal on the market.
Why the first step feels different.
The footbed is made from the same polyurethane used in our Landing Gear — the same material that professional anti-fatigue mats are made from. When you step into the Cascade for the first time, that immediate sensation of support is not cushioning. It is a material built for load management, doing exactly what it was designed to do.
What the Cascade is — and what it is not
We would rather you knew
exactly what you are buying.
A sandal is not a boot or a closed shoe. The geometry works differently in open footwear. Here is a plain account of what the Cascade does and where its physical limits are.
What it does
- ✓Delivers the core subtalar geometry built into the M-100 footbed — within the physical constraints of an open sandal.
- ✓Provides immediate load management from the polyurethane footbed — the same material as professional anti-fatigue mats.
- ✓Keeps the foot correctly positioned on the footbed through two independently adjustable buckle straps.
- ✓Blends into everyday life — a familiar two-strap silhouette that works for any setting, worn by any gender.
- ✓Gives your body the geometry during every hour it was previously going without it.
Where a sandal has limits
- •A sandal cannot provide the full wall depth of a closed shoe or boot. The geometry is present — the containment is reduced.
- •For heavy industrial or clinical use, a closed Landing Gear product remains the correct choice. The Cascade is not a substitute for the M-100 in those environments.
- •The geometry is most effective when the foot is correctly seated on the footbed — strap adjustment matters more than in a closed shoe.
Why we say this plainly. Our customers have worn our Landing Gear products through clinical validation, enterprise deployments, and years of daily use. They know what the geometry does in a closed shoe. We would rather give them an accurate picture of what a sandal can and cannot replicate than oversell a product to people who trust us.
The name
Named for the
mountains of Oregon.
The Cascade Range runs the length of the Pacific Northwest — a region that has defined how people think about the outdoors, about quality made to last, about equipment that earns its place through use rather than marketing.
The footbed walls of the Cascade echo the contour lines of a topographic map — the same oblique geometry that defines the mountain ridgelines of Oregon. That parallel was not manufactured. It was noticed.
Protalus is made in Portland, Oregon. The Cascade is named for what is visible from the city on a clear morning. It is named for the outdoors that our customers return to when the shift ends — and that they can now carry the geometry into.
From customers who have worn it
The people who asked
for this sandal tried it first.
"I have been taping my Protalus insole into my sandals every summer for two years. The Cascade is what I was trying to make. I wore them for eight hours on a beach vacation and my feet felt better at the end of the day than at the start."
"The moment you step in you feel the difference from any other sandal. It is not soft — it is supportive in a way that is hard to describe until you feel it. I wear them on my days off and my body notices when I don't."
"My husband and I both wear the same pair — the unisex sizing works perfectly. We take them everywhere. The strap adjustment is solid and they look like a sandal you would just buy, not a medical device."
The Cascade.
The geometry, open.
The same footbed material as our Landing Gear. The same geometry, within what a sandal can carry. A silhouette that blends in anywhere. Built for the hours your closed shoes are not on your feet.
90-day money-back guarantee. If it does not work for you, full refund — no questions asked.
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