SKU: 66472825407
finger gears

finger gears Funky Fingers Finger Trainer V1 – K3 Engineering

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Description

finger gears Funky Fingers Finger Trainer V1 – K3 EngineeringMore finger gains with ergonomic loading. The Funky Fingers Finger Trainer automatically adjusts to fit your hand's unique anatomy, distributing equal loads across each finger. Universal ErgoEdge: the ideal unlevelness for your unique fingers. Allows for the optimal open hand, half crimp, and full crimp position. Equal Load Distribution: The whipple tree linkage ensures that each finger is loaded with the same force. No matter how your fingers are

More finger gains with ergonomic loading. The Funky Fingers Finger Trainer automatically adjusts to fit your hand's unique anatomy, distributing equal loads across each finger.

  • Universal ErgoEdge: the ideal “unlevelness” for your unique fingers. Allows for the optimal open hand, half-crimp, and full-crimp position.
  • Equal Load Distribution: The whipple tree linkage ensures that each finger is loaded with the same force. No matter how your fingers are positioned, the force is equally distributed.
  • Portable: Packs away smaller than two decks of cards. Weighs 108 grams (3.8 oz).
  • Adjustable per-finger depth: features a quick-adjust depth stop for each individual finger. Adjustment range is from 8mm-22mm, accommodates both small and large hands.
  • Ergonomic: each finger edge has 3D-rounding to ensure comfort.

See the How to use guide for a detailed guide on how to use it.

Carabiner not included.

This is our V1 release; a fully functional, unique design that is still evolving. We welcome your feedback as we continue to refine it.

The freeform design of the FFFT means that it will take some time to learn how to use it. It will take at least 3 sessions to get comfortable with using it.

What’s wrong with a normal straight-edge block?

The straight edge and arbitrary finger depth results in non optimal loading of the finger flexor muscles and is not ergonomic for long term strength training.

Because your fingers are different lengths, a straight edge loads them differently. This is most noticeable with the pinky - when doing a half crimp, the pinky is too short to also be in the half crimp position and ends up being in an open hand position. Another example is that it’s impossible to train a three finger drag with four fingers simply because the pinky is too short. This uneven bending results in some fingers never training certain angles.

Why would I want to train with an ergonomic finger trainer?

Ergonomic finger training carries over to more grip positions.
Isometric training at a certain joint angle does not transfer well to other joint angles. This means that training on a straight edge limits your strength to holds that put your fingers in similar positions.
An ergonomic finger trainer lets you train every finger in a half-crimp and an open-hand position. This lets you train more joint angles for all of your fingers.

Why would I want per-finger adjustable edge depth?

Every finger is different, and what works for one finger might aggravate another finger. The FFFT allows you to adjust the finger depth to be comfortable for all of your fingers.

How does the FFFT let me train in any grip?

The Funky Fingers Finger Trainer uses a whipple tree pulley system that allows the fingers to be in any position. The load is distributed equally to each finger no matter the position.

See the how to use guide for more details.

Will I lift more weight with the FFFT compared to a straight edge?

No, you will lift less weight.
You will be limited by your weakest finger. This is good - you will be training your weakest link and you will quickly make gains in your grip strength.
The FFFT is an unstable surface which makes it difficult to pull as hard compared to a typical straight edge.

Will this fit my hands?

The FFFT can accommodate a finger length difference of more than 60mm (2.4in). It can also accommodate wide hands since the finger edges are attached on a rope and can be spread apart as wide as needed.
When all of the edges are touching together, it is roughly 65mm (2.5 in) wide. If your hands are narrower than 65mm, the FFFT might not be comfortable to use.
If the FFFT does not fit your hand, we will give you a full refund.

Does the FFFT replace all finger training?

No, the FFFT is designed specifically to train crimps and open hand (FDP and FDS predominant grip types). If you want to train other grip types (pinches, slopers, pockets), other specialized training tools will be more efficient.

Don’t forget to train your wrists too - you aren’t always pulling with your wrists in a neutral position.

Can I do finger curls / concentric movement / yielding isometrics with this?

Yes! This is where the FFFT shines. Since the length adjusts automatically you won’t be limited to the range of motion of your shortest finger. When doing a curl, the position of your fingertips change relative to each other. The FFFT automatically adjusts keeping equal force distributed on each finger.

See the how to use guide for an illustration.

Will this make me a better climber?

It's up to you to translate finger strength gains into sends.

Who do you recommend this for? So, is this for me?

Climbers that have several years of climbing experience and want a more efficient finger training tool.

If you are a beginner, it is likely that you still need to develop your overall grip strength, tendons / connective tissue, and climbing skill. Climbing is more than just flexing the FDP and FDS really hard - it's a movement sport, and strength is only useful if it allows you to do the movement you need.

How much weight can the FFFT handle?

Guaranteed rock solid up to 100kg (220lbs) total, 25kg (55lbs) per finger.

But what if I have really, really strong fingers?

The trainer is designed to have the rope slip at about 40kg per finger (160kg total).

I don’t have 4 fingers, can I still use this?

Unfortunately no, all four edges have to be pulled with the same force.

If you have more or less than four fingers, please reach out and I will see if a custom training tool can be made.

Can I train my toe crimp with the FFFT?

We too aspire to be like Charles. See the how to use guide.

How does this "automatic adjustment" thing even work?

To automatically adjust the length, the FFFT uses two mechanisms - pulleys and a whippletree. Two finger edges are connected together using a pulley. If the forces are unequal, then the finger edges will move relative to each other until the forces are equal again. The pulleys are attached to a whippletree - this is a linkage which behaves similar to a pulley. The linkage distributes the forces equally no matter how it is rotated. This allows the mechanism to distribute the force equally to all four finger edges regardless of the position of the finger edge.

What is the finger edge geometry?

Each finger edge curves up on the sides to cup the finger. This distributes the load across the finger much more comfortably compared to a flat edge. This allows the corner radius to be a small 2mm while still being comfortable.

Where is it made, and what is it made out of?

Made in Canada with imported parts:

Component

Material

Manufacturer

Country

Finger Edge

3D printed SLA 9600 resin

JLC3DP

China

Pulley block

3D printed BJ 316 Stainless Steel

JLC3DP

China

Pulley bearings, bolts, nuts

Stainless Steel

JLCMC

China

Rope

Polyamide

Tendon

Czech Republic

Design, Assembly, QA

Love ♥

K3 Engineering

Canada

 

So you must be an expert in strength training and have ridiculously strong fingers, right?

Quite the opposite! 

I really love rock climbing and I didn’t do any supplementary training when I first started. Initially, this was enough stimulus to get my fingers stronger. But after a while I started to notice a plateau in my finger strength.
I then started hangboarding, but it was time consuming, inefficient, and it caused finger tweaks due to my funky shaped fingers.
I ended up going down a rabbit hole of figuring out how to make finger training efficient and ended up with the funky finger finger trainer. Now I’m doing the least amount of finger training that lets me spend the most amount of time climbing.
So I (Larry, the designer of the FFFT) decided to make a finger trainer that lets me maximize the amount of time I spend climbing.

What are the gotchas?

The major ones are:

  1. The freeform nature of the FFFT does not give you any feedback on your form. In fact, it is easier to use it with bad form than good form. You have to consciously maintain good finger form for proper training stimulus. Although, this does train you to be more conscious of your grip.
  2. The finger edges pull the fingers in slightly odd directions which makes it not fully ergonomic. This is the best design I could come up with while keeping the device simple and versatile.
  3. The finger edges are an “unstable edge” which means that you won’t be able to pull as hard as possible on it. If your goal is lifting the most amount of weight on an edge, this isn’t the tool for you.

Even with these flaws, surely it’s the best there is?

No, that would be the Hand of God. It is a finger trainer that is fully customized based on a photograph of your hand. It is perfectly ergonomic and a work of art.

What is the ecological footprint of my consumerism?

The biggest ecological impact is the resin 3D printed parts. They are not recyclable, and they will wear out or break, eventually contributing to waste.

We try to be environmentally responsible with our shipping. Both the envelope and the shipping label are made from 100% recycled material, and are curbside recyclable. The shipping label adhesive is recyclable, so you should be able to just toss the packaging in the recycle bin as is.

We are thinking of ways to manufacture the FFFT that uses less plastic (especially resin 3D printed plastic), but the complex geometry of the finger edge makes that tricky.


Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
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Janola
Lake Worth, US
★★★★★ 5
Great Value for Cool Thigh Protection
Color: 02-multicolour (4-pack), Size: XX-Large
For the price, I'm not sure there are better women's boxer shortlettes anywhere. I've tried more expensive brands, and for quality and cooling, these are right up there. I have other bamboo viscose undies that still get gross when I get sweaty in the summer, but these, with the large mesh panel, really help wick away a lot of that moisture, keeping you feeling dryer and cooler. I find that the leg openings are comfortable and don't roll up! and the waist band doesn't dig, nor does it roll down. These do not provide any compression, and I wasn't looking for any. I just wanted some cooling, thigh protecting women's boxers that wouldn't break the bank. These are them! Bonus- I've washed them and put them in the dryer (following their instructions), and they haven't shrunk; they look about the same and are nice and soft.
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Reviewed in the United States on July 28, 2025
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Lake Worth, US
★★★★★ 4
Great for the entire family but expensive
So far so good. The brand of boxers we had been buying changed their style and construction so we needed to find an alternative. These have held up well so far to multiple weeks of frequent washing and wearing from the entire family. We did size up from the usual 6/M we normally buy and ordered large to prevent the legs from rolling up which worked out great. Our daughter likes the length and how soft the fabric is for wearing under skirts and gym shorts and liners stay put without moving or leaking as another reviewer mentioned. Our son says they are comfortable and fit well being just supportive enough without being constrictive. We all agree that there seems to be not enough fabric in the back as they tend to be much tighter across the backside than the front and that also causes the waist band to ride lower in the back than the front. These have better seam placement than some brands we tried with no seam across the lady bits and no seam down the middle of the back side so they are more much comfortable but the cost is also much higher and that is why we're only giving it 4 stars. These will stay in the rotation until we find something cheaper that both us and the kids like.
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Reviewed in the United States on January 24, 2026
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Brittany
Boise, US
★★★★★ 5
Pregnant lady review! Soft, comfortable, cool.
Color: 03-multicolour (4-pack), Size: Large
So soft, comfortable and cool. I'm pregnant and I've gained weight in my legs. I love wearing dresses but my thighs were rubbing together too much. These are perfect to wear under dresses. I also wear them under my bibs at work and it keeps me from getting overheated but I don't have to worry about whether or not my underwear show since they just look like shorts. I wish these came in maternity. I just keep them below my belly. I'll be buying more for sure.
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Reviewed in the United States on April 8, 2026
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Janessa L.
Los Angeles, US
★★★★★ 5
I want to live in these
Color: 01-multicolour (4-pack), Size: Medium
I bought 4 different sets of new underwear. Unfortunately these came last. It’s unfortunate, because if they had come first I would have cancelled all my other orders or returned them and ordered more of these. I never want to wear anything else ever again; these are the comfiest undies I’ve ever owned, I want to live in them. I can wear them under pretty much anything except leggings or very tight pants (but let’s be honest, I don’t wear those anyway.) They are incredibly soft and breathable, they wash well, don’t roll, keep my thighs from rubbing, are comfy to sleep in, and the colors were true to the photo. Just a heads up, they are on the thin side and just a bit see through in the rear. I’m 5’5” 140lbs and the mediums fit perfectly, they go about mid-thigh.
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Reviewed in the United States on July 30, 2025
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Pistol King
New York, US
★★★★★ 5
Extremely comfortable
Color: 02-multicolour (4-pack), Size: X-Large
These are by far the softest and most comfortable underwear I have ever owned. The leg portion absolutely does roll up as so many others have mentioned, however, I did not find that to be uncomfortable at all just annoying that they don’t stay in place. I bought these specific underwear to see if it would help alleviate HS symptoms at all. They have definitely helped with wicking moisture away from the skin. More time will tell if it’s truly helpful for HS. For now, I will recommend these. They are thin, breathable, butter soft, wick moisture comfortable and I would buy again…maybe in a different style next time. I have washed them several times and they seem to be holding up rather well so that is also of supreme importance given the cost of the item. Again, I would recommend this item and plan on purchasing more in a different style very soon.
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Reviewed in the United States on September 13, 2025

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