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Neck Flex® MMB Pro Series Kit — Neck Harness

Sale price $119.95
Regular price $159.93

Neck Flex® MMB Pro Series Kit — at a glance

  • What it is: a plate-loaded and band-loaded neck training head harness, named for strongman Mike "The Machine" Bruce and built on the patented Neck Flex platform.
  • In the box: MMB Pro harness, heavy-duty weight-lifting chain and carabiners, Bodylastics® 19 lb resistance band, Bodylastics® door anchor, Neck Flex tote bag, sticker, and instructional videos. Ready to train on day one.
  • Trains: neck flexion, extension and lateral flexion through vertically oriented D-rings on each quadrant of the harness; add the Revolver™ attachment for loaded rotation. A front power strap keeps the harness out of your eyes under load.
  • Loading: resistance bands from a door anchor, weight plates on the included chain, or a cable stack.
  • Evidence: the Neck Flex is the head harness named in three peer-reviewed papers from a Royal Danish Air Force randomized controlled trial (BMC Musculoskeletal Disorders 2015 and 2017; Frontiers in Public Health 2020). In 2021 a federal court granted a preliminary injunction after finding a competitor's harness matched the Neck Flex "apparently even down to the stitching pattern." Full evidence profile · Neck Flex vs. Iron Neck.
  • Made by: Gonza LLC, Leesburg, Virginia. Designed and engineered in the United States. Sold since 2012. Five U.S. patents.

The MMB Pro was created in collaboration with Mr. Mike "The Machine" Bruce. We built upon the same patented Neck Flex platform to develop a harness that accommodates both plate loading and resistance band applications. The MMB Pro breaks the mold, a game changer. If you're serious about training, then step forward.

The Neck Flex® MMB Pro Series Kit is a heavy-duty, multi-patented head harness system engineered in collaboration with world-renowned neck strength expert Mr. Mike Bruce. Built on the advanced, medical-grade Neck Flex platform, it seamlessly integrates both progressive plate loading and resistance band training. This hybrid design delivers unmatched stability and safety, providing a comprehensive solution for complete cervical conditioning, elite athletic preparation, and injury prevention.

Biomechanical Advantages Over Competitors

Independent industry experts like The Strength Classroom have visually demonstrated the functional superiority of the MMB Pro over competing models like the Iron Neck Alpha Harness. While alternative designs were altered following court litigation with Neck Flex (GONZA LLC), those structural modifications changed how the product loads. The MMB Pro outperforms them across critical specifications:
  • Correct D-Ring Orientation: Features specialized "dog-ear" and vertically aligned side anchor points. This allows for a anatomically correct line of pull during lateral (side) neck flexion, unlike the flat, horizontal D-rings on the Alpha harness which cause slippage and bad training angles.
  • Integrated Front Power Strap: Equipped with a crucial front power strap to lock the harness down. This keeps the unit from shifting or riding up your face during intense forward flexion and extension drills.
  • Superior Material Integration: Constructed using premium, thick diamond-embossed neoprene padding and polished, welded heavy-duty steel D-rings. This resists degradation far better than the thinner, non-embossed fabrics used on cheaper rigs.

Primary Training Targets & Use Cases

  • Concussion Prevention & Impact Sports: Maximizes kinetic stiffness to buffer high-velocity rotational impacts in football, MMA, wrestling, and lacrosse.
  • Advanced Hypertrophy & Bodybuilding: Promotes balanced muscular growth in the sternocleidomastoid, splenius capitis, and trapezius for a thicker, more powerful look.
  • Chiropractic & Clinical Rehabilitation: Provides controlled, non-axial loading options for physical therapy, correcting forward-head posture ("Tech Neck"), and treating whiplash.
  • Progressive: start with the included band and add plates on the chain or a cable stack as you get stronger.

Complete Pro Kit Inventory

  • The Patented MMB Pro Head Harness with adjustable multi-point straps.
  • Heavy-Duty Weight Lifting Chain & Carabiners for direct plate loading.
  • Bodylastics® Patented 19 lb Resistance Band with snap-reduction safety tech.
  • Bodylastics® Door Anchor and an industrial Neck Flex Tote Bag.

Comparing options? Read the full Neck Flex® vs. Iron Neck comparison — sourced, movement by movement.

Named in peer-reviewed research

When researchers ran a 20-week randomized controlled trial on 69 Royal Danish Air Force helicopter pilots and crew, they had to name their equipment in the methods section so that other labs could reproduce the work. The harness they named was ours: "a head harness (The Original Neck Flex® Head Harness, Gonzo Companies, USA)."

That choice was made during study design — before any results existed, by researchers with no stake in selling harnesses, for a protocol that ran three times a week for five months without supervision. Fit across 69 heads, load stability, padding and stitch integrity at the load points all had to hold, or the data would not.

Murray, Lange, Søgaard & Sjøgaard, Frontiers in Public Health, 2020.

Read the full breakdown of the study

The vital importance of neck strength

Neck strength is often overlooked in training programs, yet it plays a critical role in both performance and injury prevention, especially in contact sports and physically demanding professions. Head and neck injuries, including concussions, can have long-term consequences, making it essential for athletes and coaches to take neck conditioning seriously. The Neck Flex® was created to address this need by providing a safer, more effective, and more versatile alternative to traditional neck training methods. Unlike standard harnesses or machines, the Neck Flex® allows for controlled, multi-directional movement that better prepares the neck for real-world demands.

The vital importance of neck strength

Neck strength is often overlooked in training programs, yet it plays a critical role in both performance and injury prevention, especially in contact sports and physically demanding professions. Head and neck injuries, including concussions, can have long-term consequences, making it essential for athletes and coaches to take neck conditioning seriously. The Neck Flex® was created to address this need by providing a safer, more effective, and more versatile alternative to traditional neck training methods. Unlike standard harnesses or machines, the Neck Flex® allows for controlled, multi-directional movement that better prepares the neck for real-world demands.

Real Results. Real People.

The craftsmanship of this product standouts. The stitching looks very clean and well done. The fit was perfect for both myself and my son. Since using the ballistic my chronic neck pain, due to my manual labor job, has subsided greatly...

CN / Verified Customer

I sit at a desk a lot. This gives me a chronic stiff neck. The NeckFlex has been awesome at giving me a way to stretch and strengthen my neck. It's vastly helped with my constantly stiff neck. It's super easy to use, and I even use it while working at my desk...

Dane Wence / Verified Customer

After reading so many reviews about the durability and comfort problems with other brands, I decided to give Neck Flex a try. It's obvious that the Ballistic Kevlar Series is built to last. It's also very comfortable to wear...

Glenn / Verified Customer

Picked this up to accent my regular weight lifting and because neck workouts would be much easier with this device than trying to balance plates or dumbbells on my head.

A. Thomas / Verified Customer

If you have never use a neck harness for bands before you need to get these. It can do everything a 4 way neck machine can do but with bands. Rotation exercises are easy to do as well. The product is very well built as well and should last a lifetime.

Author name here / Verified Customer

  • 5 stars: 45 (94%)
  • 4 stars: 1 (2%)
  • 3 stars: 1 (2%)
  • 2 stars: 0 (0%)
  • 1 star: 1 (2%)
L
Longshanks

I started with the Halo about 10 years ago. This summer, I bought the MMB Pro for my son who plays football. He and his friends workout in the basement and all use both the Halo and the MMB pro. They saw results within a few weeks. Excellent product. Very durable. Very effective. Very safe because I know it won't break - even when they are doing whatever teenage boys do in a weight room.

Judge.me YouTube video placeholder
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David G

I have strength trained for about three decades, although I never gave a second thought to strengthening my neck. I’ve also had tight, sore neck muscles, random kinks after waking up, etc, and just thought it was normal. After hearing about neck training and the benefits it can provide, I decided that I had nothing to lose and would give it a try. I didn’t want a cheap piece of junk so I went for the Neck Flex, which seemed to be of higher quality than your average neck harness. When it arrived I can certainly confirm that this thing is built like a horse harness, and is very solid and well made; I went with the MMB Pro. I’ve been using the Neck Flex for about three weeks now, and I can feel a huge improvement in my neck muscles, and haven’t had a neck kink since I started training with it. My neck feels more solid, and for the first time in decades, I don’t have that tight, strained feeling I used to have so often. I think neck training is so underrated and if this improvement in myself is only after barely three weeks, I’m excited to see where I’ll be a few months from now. If you’re a lifter who’s had neck issues over the years, do yourself a favor and grab one of these. They’re well worth it.

David, thank you for taking the time to write this. Thirty years of lifting and the neck finally gets its turn! The amount of awesome coming your way... Enjoy! TEAM NECK FLEX

V
Vic P.

Received my Neck Flex MMB Pro Series kit last week, starting using immediately. Couldn't be happier! I can use it with the included band, as well as my functional trainer cable machine. Even in the short time I have been using it I have already noticed a difference! Great company, great communication and prompt delivery of product as advertised.

F
Freddy Weites

I must thank Cody Janko from the Stone Cirkel, he inteoduces the Neck Flex to me.
It is the Ferrari het of the harnasses
Very comfortabel on the head.
When you look at it you know it is good
Thank You from Holland

D
Dan M.

The equipment came well packaged. The headgear and harness are very well-made.. adjusting to fit is simple and I find the apparatus comfortable to use . I would definitely recommend this product to somebody looking to safely build up their neck muscles now it’s up to me to put in the work. Thank you Neck Flex!

E
Erik Koblar

Great product, as well as costumer support.

Y
Yarden Miller

This thing brings your neck strength to the next level! Got it shipped from across the globe just cause I know this thing will bring me to the next level! Thanks!

T
Thomas L Brittingham

Excellent piece of equipment. I've used the included resistance band to perform multiple movements as well as the chain to suspend weights. Everything I've done with it has been comfortable and effective. Feels well built as well. I've had neck harnesses in the past break on me. I don't see that being an issue with this item.

R
Russell Thompson

Good quality product. Mostly use the resistance bands so far, and they work well. Service (delivery) was excellent. Would recommend.

K
Kashif Ahmed

excellent product

A
Anonymous

I bought this a year ago at 64 for simple neck strengthening. I had bought a cheaper one on Amazon and sent it back. Neckflex is built like a battleship. Easily adjusted to fit my head comfortably. The included surgical tubing attachment is all I will ever need and works great to do multiple different exercises. Don't cheap out, get this one.

A
Anonymous

Great product and durable. This device has helped my 2 sons prepare starting early in their HS careers to become college offensive linemen…got to have strong necks!

L
Lifter

Product is really high quality.

A
Anonymous

My neck harness had a factory defect and i immediately got a replacement with no issues at all. Excellent product and customer service.

P
Patrick Ashton

Great piece of training equipment. Easy to go from one neck exercise to another.
Fits comfortably on head.
Have tried other neck training gear. This is the best so far.
Cheers

A
Anonymous

Very well built product. I work at a training facility and have tried competitor's products to include a "top of the line" and very expensive pro product and Neck Flex is just a better overall product in my opinion. Highly recommended.

P
P.A.

This thing is built to last several lifetimes! I've been using the supplied resistance band with the door anchor. At 45yo, this is the training I've been missing all my life. Thanks Neck Flex!!!

K
Kelly Jordan

The harness does the job but as far as comfort is concerned they could do much better. When you do heavy neck rotations and the chain squeezes your skull its awful. The instructional video left a lot to be desired . More like broscience than a helpful tutorial.
Would I recommend for all that I paid sending it to Australia, the answer is NO.

Kelly, thank you for the honest feedback. You’re right that heavy rotations with the chain can put pressure from the chain on the head. It's a quick fix. For rotation work we recommend the included resistance band instead, which takes that pressure off, and our Official Training Video 2 shows how. I’ve emailed you directly, and my cell is in that email if you’d like to talk it through. — Thomas Hunt, founder

D
David

Great product and service, get yoked

W
WGL

Well made product with good stitching and an excellent design.

J
Jeff

Been using it for a couple of weeks and already notice a difference. Seems high quality and works well

O
Oliver Duran-Garcia

Great fit, easy to work with and solid construction. No complaints.

A
Alejandro E

The product is good, perfect for athletes looking into strengthening their neck muscles for sport or any general activity

B
Byff

Skip the Cheap Knockoffs — Buy Quality Once!

I've been using the Neck Flex MMB Pro Series Kit for the past six months, and I couldn't be happier with it. The construction is exceptionally durable, the fit is comfortable and highly adjustable, and the overall design is extremely well thought out. The straps and attachment hooks are positioned exactly where they need to be, providing tremendous flexibility for a wide variety of neck-strengthening exercises. Nothing about this harness feels cheap or poorly designed.

What really sets this product apart is its versatility. Whether you're just beginning to develop neck strength or you're an experienced lifter looking to build and maintain strength from every angle, this harness gives you myriad workout options. Moreover, the adjustability makes it easy to tailor your workouts to your individual needs and fitness level.

My advice? Skip the inexpensive, generic neck harnesses you find all over Amazon and invest in a quality piece of equipment from the start. After six months of use, I'm convinced this harness is built to last a lifetime with proper care. You might spend a little more upfront, but you're getting a superior product that should serve you well for years to come. And as a fellow veteran, I'm especially pleased to support a veteran-owned business that clearly takes pride in the quality of its products. Highly recommended!

A
Ali Nasrallah

It is a great product with a high grade quality, and most importantly it works for me very well, I saw noticeable results in the first two weeks, and now I almost reached to the result I am looking for.

A
Anonymous

Great product

A
Anonymous

The best in the market!

C
Cowboy

I needed to strengthen my neck to assist in recovery. I started slow. Now my meck is stronger than it has ever been. Ive trained weights for decades and never trained my neck until recently. I 100% recommend this rig. You have to put the work in, but you have to have the right tools and this thing is awesome. I owe Neck Flex more than 5 stars. I owe them thanks as well.

A
Anonymous

Great product. Sturdy construction suitable for all neck exercises. Delivery and service was great.

A
Anonymous

5⭐️

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