Article written by Nemo Sandman – Edited the 5th of November 2025.
All rights (pictures and text) reserved.
Have you ever wondered why so many Spyderco Sprint Runs seem to appear out of nowhere, featuring gorgeous carbon fiber handles and impressive CPM S90V blades?
It’s simple — Sal Glesser loves both materials.
For him, carbon fiber reflects his lifelong passion for motorsports, while S90V stands out as a stainless steel in a league of its own, combining high performance and outstanding reliability.
So, long story short:
Full Flat Grind + Carbon Fiber + S90V = Sal Glesser’s favorite combo!
And to quote my friend Spydercollector:
“When the Bushcraft fixed blade was first announced, Sal also planned to do a so-called NASA version; a version of the Bushcraft knife with all high-tech materials. I believe NASA is a protected name, but Endeavour still evokes the high-tech approach most people associate with the famous space agency. The Endeavour features a full flat grind S90V blade and full sculpted carbon fiber handles. It was a beautiful knife with a grip that had me looking around for stuff to cut.”
https://spydercollector.wordpress.com/tag/chris-claycomb-endeavour-prototype/
Here is the Proficient: it is designed by wilderness expert Chris Claycomb of Bushcraft UK, the Proficient functions perfectly with traditional bushcraft skills and cutting methods. Carefully contoured and polished to eliminate hot spots and ensure maximum comfort during prolonged use.
https://www.spyderco.com/catalog/details/FB36CF/Proficient-trade-/943
Bushcraft knives are defined by specific parameters — typically featuring blades between 4 and 6 inches. Spyderco’s Bushcraft model fits perfectly within that tradition: a 4-inch, full-tang blade with no handguard, purpose-built for control and versatility.
In true Bushcraft spirit, users generally favor high-carbon tool steels over stainless options, prioritizing edge retention and cutting performance rather than corrosion resistance. The O-1 tool steel used here, with its high carbon content, delivers excellent long-term sharpness while remaining easy to resharpen in the field.
Carried on the belt or strap in a leather sheath, this knife is blueprinted for wilderness chores — slicing, chopping, whittling, and processing game — all in the traditional Bushcraft style.
To quote Spyderco:
“The Spyderco Proficient takes the concept of the traditional “do-all” bushcraft knife and elevates it to new levels of performance with state-of-the-art materials and manufacturing methods. Designed by wilderness expert Chris Claycomb of Bushcraft UK, the Proficient functions perfectly with traditional bushcraft skills and cutting methods while offering superior durability, edge retention, cutting performance, and corrosion resistance
Instead of traditional carbon steel and an axe-like “Scandi” (Scandinavian) grind, the Proficient’s blade is crafted from vanadium-rich CPM®S90V particle-metallurgy stainless steel and boasts a full-flat grind for low-friction cutting performance.“
This concept of a stainless blade paired with a black polished handle has, ten years later, been fully embraced — a perfect example being the Casström No.10 Swedish Forest Knife in Black Micarta with a 14C28N flat grind.
I first discovered CPM S90V back when it was still known as CPM 420V, thanks to Darrel Ralph (RIP) and his beautiful Apogee folder. The blade was astonishingly wear-resistant — so much so that, without diamond abrasives, only a backstand could bring it from dull to sharp. It was a bear to sharpen then… and still is today.
The difference is, as end-line users, we now have easy access to industrial diamond tools, making steels like S90V finally practical to maintain at their full potential.
I have written a lot about S90V. This alloy has proven it can be tough enough as a stainless steel to be used in any all terrain tools; especially since it is available on Manly folders which got the reputation of using a very fine thin geometry on their blades.
Modern Bushcrafters (like the Benchmade Puukko) are focused on toughness with the use of the very tough CPM 3V.
What does CPM S90V bring to the table?
It’s incredibly wear-resistant.
This steel is notoriously hard to dull, even when cutting abrasive materials like brown cardboard loaded with silica. It keeps its edge far longer than most steels, making it ideal for demanding, real-world use.
Also the full flat grind is a must in a matter separator specialized in wood works. As much as I love Scandi Grind found on Woodlore clones (first designed by Ray Mears).
I have found that especially in the wonderful Spyderco Sprig full flat ground knives can be really efficient on hard wood.
(BTW when the writing appears in green: it is a link !! and I have tested them here.)
It’s stainless!
Even if you (like me) enjoy the patina that forms on a great carbon steel blade, there’s real peace of mind in using a reliable stainless steel — especially when working near water, in the rain, or by the sea.
The Sprig was an impressive tool in terms of pure geometry. Designed as a hunting and fishing knife, it was a real wood eater — a beaver of a blade, cutting deep and effortlessly.
Guess what? The Proficient shares the same profile, especially after a bit of convexing — which I’ll be covering soon in a second article.
So far, that contoured handle is an absolute delight to use, and I’ll be putting it to the test in the upcoming piece. While the old O1 Bushcrafter had enough heft for light chopping, the Proficient excels at powerful push cuts — a completely different experience.
Interestingly, the Proficient isn’t a big knife. Once sheathed, it can disappear into the front pocket of a pair of denim jeans — no need to let it dangle from a belt.
So what do we got ? Imagine the plateforme of the Bushcrafter (link) a solid companion, a reliable 4×4 and you just turn it into some Urus from Lamborghini: stellar alloy and lighter tougher handle.
The Proficient is Sal Glesser’s gambit — a bold move in a world where the bushcraft community traditionally favors carbon steel and natural wooden handles. This knife dares to break from that norm.
Of course, this jewel comes at a price, and most bushcrafters aren’t Wall Street sharks. They use Opinel, Mora, or at best a €100 fixed blade — unless they’re ready to splurge on an original Woodlore.
So, the “stealth wealth” of this NASA-grade bushcrafter isn’t for everyone.
It’s like a Lamborghini — not the most practical, but a statement of refined performance and engineering excellence.
Because in the end, real performance comes at a price.
Article written by Nemo Sandman – Edited on November 5th, 2025.
All rights (pictures and text) reserved.
NemoKnivesReview 