Everything on this page is the public record: independent reviewers, clinicians, journalists, athletes' own public footage, and customers speaking in their own words on their own platforms. Where a reviewer has a partner or affiliate relationship with us, we say so. This page is updated as new independent coverage appears. Last updated: August 2026.

Who has independently reviewed the Neck Flex®?

Independent reviews of the Neck Flex span more than a decade — from 2014 gear channels to 2025 full-category equipment tests. The most substantial, embedded with our notes:

The Strength Classroom — "I Tried Every Piece of Neck Equipment (So You Don't Have To)" (September 2025)

A head-to-head test across the neck training category, including harnesses, bands, and the ring-and-track device class. Among its conclusions: the Neck Flex HALO's vertically-oriented front and rear D-rings pull in the correct direction for resisted neck movement — a design point viewers debated at length in the comments. (Disclosure: this channel offers a Neck Flex promo code.)

The Strength Classroom — "Which Neck Equipment Is Actually Worth Buying? (Full Test)"

The full-category value test we also cite in our Neck Flex vs. Iron Neck comparison.

1st508th Airborne — "Neck Flex Revolver vs. Iron Neck Pro"

An independent side-by-side of loaded neck rotation on both systems — the comparison we cite in our article's rotation section.

Synergy Wellness Chiropractic & Physical Therapy — "Neck Flex Head Harness for Neck Strengthening: Product Review"

A practicing chiropractic and physical therapy clinic's 16-minute clinical assessment of the harness for strengthening and rehabilitation use.

Earlier independent reviews (2014 onward)

• Nick Nilsson, "The Mad Scientist of Muscle" — The Neck Flex: Training Equipment Review — one of the earliest independent reviews on record (16K+ views).
• RATETHISGEAR — Neck Flex Review — independent gear channel, 16K+ views.
• Dr. Grip — Neck Flex Review (2014) — grip-and-strength channel's early review; over a decade of the product on the public record.
• fatlosspro — The Secret to Building a 25" Neck, Part 2 — harness-based neck building, 41K+ views.
• HΞRSΘVYΛC (written review) — "NeckFlex Review: an Honest Take" — an independent written review.

What do customers say on independent reviews?

Real viewer comments from the equipment tests above — lightly trimmed, authors credited, on the public record at the linked videos:

"I was just about to order an Iron Neck harness before catching your video. I took a shot and ordered the Neck Flex MMB Pro... and love it. Not only is it built to last, it's designed by someone who actually [cares] about functional neck training... This one works and it's built to last." — @jimr880

"You solved all of my 'neck training search for the right piece of equipment' mysteries in less than 10 minutes. Going with the Neck Flex Halo bundle!" — @jonathanreid8024

"Saved me from buying that [ring-style] Alpha Harness... Probably gonna grab a Neck Flex with the pulley attachment!" — @shu9460

"Neck Flex Halo is the winner here tho!" — @louieortega3378

"I've had my Neck Flex for a couple months now and I'm absolutely loving it. Before that I purchased the iron neck harness and I ended up returning it. No comparison. American made, Veteran owned, unmatched quality. Best neck strengthening piece of equipment out there!" — @JasonGage

"Neck flex is the single best thing I have bought for my gym since my power rack..I use it 3 times per week and have put on over two inches to my neck size." — @Mr-mopar

"The Neck Flex has the best equipment for training neck and for rehabilitation. It has fixed my neck pain from years of jiu jitsu and grappling. The first part of any workout or class is strapping on a Neck Flex and warming up the Neck and upper spine." — @coalman1313

"The Neck Flex is Best in the business. I own two... These are hands down the most comfortable, durable, and flat out professional neck harnesses in production." — @arboroak1633

"Outstanding product. I have been a customer of Neck Flex for over 10 years because I coach wrestling. Every time Neck Flex comes out with a new model, I always get in it... The kits from Neck Flex from over 10 years ago are still going strong, including the bands." — Jamie Given, verified Amazon purchase, December 2022

Across the fifteen independent videos that review or feature the Neck Flex — spanning 2012 to 2025 and totalling more than 9.7 million views — seven commenters describe returning or rejecting a competitor in favour of the Neck Flex, and four report a specific measured gain in neck size. Those comments, positive and critical alike, are collected verbatim at NeckFlexReviews.com.

The Neck Flex on Amazon: the numbers

Neck Flex sold four products on Amazon from December 2022 until withdrawing from the platform in 2026. The listings remain publicly visible, so every figure below can still be checked against Amazon directly.

• 234 verified customer ratings across the four products, averaging 4.4 stars, with a median rating of five stars. 68% of all ratings are five-star; 83% are four or better.
• The MMB Pro Series holds 4.7 stars from 74 ratings — and never received a single one-star review. ASIN B0BN9JLKM7, distribution 85 / 7 / 5 / 3 / 0.
• 85% of its ratings are five-star — the highest five-star percentage of any neck training harness sold on Amazon. All 25 neck harnesses on amazon.com with 50 or more ratings were checked and their star distributions read directly off each listing. The next closest is 80%; the category median is 70%.
• It is also the most consistently rated harness in the category — the least polarising of the 25, measured by the spread of its rating distribution.
• Ballistic Kevlar® Series: 4.3 stars from 61 ratings. The Original head harness: 4.1 stars from 95 ratings. Revolver™ rotation kit: 4.5 stars (UK listing).

Every one of those reviews — including the critical ones, published in full with responses — is archived at NeckFlexReviews.com.

How does that compare to the ring-and-track category leader?

Against Iron Neck's best-selling model, measured across their 769 ratings and our 74: 85% five-star versus 71% — a 14-point margin. Their flagship draws a one- or two-star review 3.7 times as often (11% against 3%). The MMB Pro's bottom-tier rate is lower than every Iron Neck listing on Amazon, and its 4.7-star average is higher than all ten of the most-reviewed neck harnesses on the platform, none of which exceeds 4.6.

Figures read from amazon.com on 15 August 2026, across all 25 neck harnesses on the platform with 50 or more ratings. Ratings change; every ASIN above is linked so you can check them yourself.

How far back does the public record actually go?

To 2012 — fourteen years — and it is documented rather than asserted:

• The USPTO trademark record for NECK FLEX (Serial 88592849) gives first use in commerce as 1 January 2012.
• A YouTube video dated 11 September 2012 carries TheNeckFlex.com in its description — the earliest contemporaneous public artifact we have found.
• Mike "The Machine" Bruce began publishing Neck Flex training posts on his blog on 27 December 2012, followed by four more that week. He deleted that blog years ago; the posts survive in the Internet Archive.
• The provisional patent application was filed 4 September 2013, issuing as US 11,007,405.
• Two customers writing a decade later independently date themselves to the same period — a wrestling coach in 2022 describing ten years as a customer, and another in 2024 describing ten years of use.

Each item is dated and linked, with Internet Archive links where the original has been deleted, on the NeckFlexReviews.com timeline.

Which athletes and public figures are documented using the Neck Flex?

We report only what's documented in published journalism and public footage — we don't claim endorsements.

• As reported by WV News (July 27, 2026) in its profile of co-founder Tom Hunt: users of the device have included strength athlete Mike "The Machine" Bruce, UFC fighters Jon Jones, Dustin Poirier and Benoît Saint Denis, professional boxer Anthony Joshua, and Formula 1 driver Alex Albon; fitness educators Jeff Nippard and Jeff Cavaliere have promoted the product. Per the same report, Neck Flex equipment is used across organizations including the NFL, NHL, UFC, NASCAR, Formula 1, NCAA, NRL, IBJJF and WBC, plus youth sports programs, military and tactical units, and physical therapy clinics.
• Alex Albon (Formula 1) — neck training with a Neck Flex HALO harness documented in his own public Instagram footage (January 2024).
• In film — Neck Flex equipment appears in Apple Studios' F1 (2025), as reported by the Washington Business Journal; the same outlet reported actress Halle Bailey used the device training for The Little Mermaid (2023).

Mike "The Machine" Bruce on neck training with the Neck Flex

The strongman behind our MMB Pro Series — known for one of the strongest necks in the world — discusses neck training with the Neck Flex on camera:

More documented footage: Get Yoked with Mike "The Machine" Bruce (World's Strongest Neck) · How to Train Your Neck for Size and Strength — Mike Bruce interview · Is the World's Strongest Neck impervious to being choked out?

Where is the Neck Flex discussed in training communities?

Practitioner communities have compared the Neck Flex to ring-style devices for years — including threads on r/bjj (rotation-tool comparisons), r/wrestling (affordable-alternatives discussions), and the Sherdog combat-sports forums. We link searches rather than individual threads; read the communities' unfiltered takes for yourself.

The official video library

The brand's own demonstration and instructional content — distinct from the independent coverage above, and useful for seeing every movement performed correctly. Highlights from the official Neck Flex YouTube channel:

• Neck Flex vs. Iron Neck (2026): The 4-Movement Test — the current side-by-side, embedded in our comparison article
• How D1 and NFL Football Train Neck — 218K+ views, the channel's most-watched training video (in the Neck Flex Compilation playlist)
• Neck Circuit Training: Sports Concussion Prevention and Treatment — 61K+ views (same playlist)
• How to Workout Your Neck (21K+ views), Neck Exercise for Wrestling, Neck & Trap Workout Together, and 4-Way Neck Harness with Cable Machine Stack (22K+ views) — all in the compilation playlist
• Official Training Video 1: Beginner / Basics and Official Training Video 2: Advanced Techniques
• The Difference Between Neck Flex Kits — choosing between HALO, MMB Pro, and Ballistic
• Neck Harness Basics Explained and Neck Flexion Exercise on Cables
• The Revolver™ rotation series: official instructional, the ultimate rotation training guide, and rotation attachment demonstration
• Earlier comparison archive: Iron Neck vs Neck Flex (2022) and rotation attachment comparison
• The full curated review archive: Various Neck Flex Reviews playlist and Official Training Videos playlist

The documented design record

For readers evaluating this category's history: Gonza LLC's five U.S. patents (11,007,405 · 11,413,491 · 11,638,850 · 11,638,851 · 12,029,936), the December 2021 preliminary injunction in Gonza LLC v. Mission Competition Fitness Equipment, and the observable design changes that followed are documented with primary sources in our plain-language legal history and the full Neck Flex vs. Iron Neck comparison.

Frequently asked questions

Are these Neck Flex reviews sponsored?

No — the reviews above are independent content by their creators. Where a creator has an affiliate or promo relationship with Neck Flex, it's noted beside their entry. Review units are sometimes provided as gifts; an honest opinion, including criticism, is the only ask.

Do professional athletes really use the Neck Flex?

Multiple athletes' use is documented in published journalism (WV News, July 2026; Washington Business Journal, 2025) and in public footage — including UFC fighters and a Formula 1 driver. We report the documentation; we don't claim endorsements.

Has the Neck Flex been reviewed by medical professionals?

Yes — including a published 16-minute video review by a practicing chiropractic and physical therapy clinic evaluating the harness for strengthening and rehabilitation.

What are the Neck Flex's Amazon ratings?

Across four products, 234 verified ratings averaging 4.4 stars with a median of five. The MMB Pro Series holds 4.7 stars from 74 ratings with zero one-star reviews, and its 85% five-star share is the highest of any neck training harness sold on Amazon with 50 or more ratings.

Why is the Neck Flex no longer sold on Amazon?

Neck Flex withdrew from the platform in 2026 and now sells direct. The listings were not removed for policy violations — the company pulled them. The Neck Flex ships as a kit built from Kevlar® and ballistic nylon, and the marketplace fee structure meant either cheapening the product or raising the price. Selling direct puts that margin into the materials instead. The listings remain publicly visible, so the ratings above can still be verified.

How long has the Neck Flex been reviewed publicly?

Independent reviews date to 2014, and the product's own public record runs to 2012 — fourteen years — evidenced by a USPTO first-use-in-commerce date of 1 January 2012, a September 2012 video linking the company site, and a run of December 2012 blog posts recovered from the Internet Archive. Development began in 2010. The device is protected by five U.S. patents.

Reviewed the Neck Flex on your platform? Tell us: support@theneckflex.com — we add substantive independent coverage to this page.

Further reading

The most rigorous third-party record of all — the Royal Danish Air Force trial whose three peer-reviewed papers name the Neck Flex harness in their methods — has a full independent account at necktraining.com/neck-flex. NeckTraining.com is a reference archive published by Gonza LLC, the maker of Neck Flex, with that ownership disclosed on every page.

The complete reception archive — all 234 Amazon ratings with every review reproduced, fifteen independent video reviews with viewer comments, and a dated timeline back to 2012 — is at NeckFlexReviews.com. It is also published by Gonza LLC, with the same disclosure on every page, and it publishes the negative reviews in full alongside the positive ones.