The Mullet Stud. It’s New, It’s Edgy, And it’s Legal?

“Holy fuck”, I said. “That can’t be legal”.

Hold on, McGeady. Start again. Use your words.

There is a new type of rugby stud on the market. Photo and video of the strange design crossed the desk at McGeady Towers. My eyebrows rose sharply as the strange design of the “Smart Power Profiler” stud became more and more clear.

The easiest way to describe the thing? The Mullet Stud: sensible at the front, edgy at the back.

The Mullet stud: sensible in front, edgy at the back.


For your convenience, here’s a link to the manufacturer’s website: Smart Power. A working knowledge of the French language is recommended, but you’ll get the gist.

And a video.

The manufacturer’s website links out to ADN Rugby, where the studs can be purchased online:


A journalist remains unflappably calm at all times

Yes, you can buy them. “Fucking fucking fuck”, I typed to a close rugby contact when I saw that these things are actually on sale. Being on sale implied that they were beyond concept and very much a real thing. A real thing coming to a pitch near you.

My eyebrows rose still further upon noticing wording on the company’s website stating that the Smart Power Profiler is licensed by World Rugby and had passed World Rugby’s tests.

Time to ask a few questions about rugby studs. Not the world’s most lively topic, we’ll agree. But we have been here before, in this parish.iii


Testing Testing A, B

Licensed by World Rugby, eh? It’s passed their tests? I asked Smart Power if this was so.

Yes indeed, they said.

World Rugby confirmed their legality last week, said Smart Power, and a note will be issued from World Rugby’s officiating department about them.

Smart Power Profiler studs. Photo supplied by Smart Power.


Over to World Rugby, who said while studs don’t actually get licensed by them the stud has passed their tests.

“They must conform to the provisions outlined in Regulation 12 (see the World Rugby Handbookiii). In this case, these studs have been independently tested and were found to conform with Reg 12.”

That is to say, these studs are indeed rugby-legal.


Vox Pop

Over a few hours I asked around. People in the game. Have you seen these new studs? What do you think?

Stud comparison.
Source: Facebook post by Cedric Juveneton and shared by Smart Power.

A current professional player told me that he’d seen them; that the manufacturer wanted him to try them out. He knew they had been in the process of being approved and thought the studs might work well in providing extra grip.

“That’s the first I’ve seen of them and hopefully the last. They look very dangerous.” said another professional player after I showed him a photo. Of course I then had the dubious pleasure of informing him that they have been deemed legal.

“I’ve enough to worry about without being responsible for someone getting a mid game dissection”, said a member of a professional side’s backroom team.



To peer back to my expletive-filled intro, how exactly are these legal? The stud seemed at adds with the descriptions outlined in Regulation 12 of what a stud needs to conform to.

This Regulation contains a useful diagram.

Dimensions of a legal stud. Credit: World Rugby Regulation 12

In comparison, a diagram of the Smart Power Profiler.

These look… different.

When asked for enlightenment, World Rugby directed our attention to specific wording in Regulation 12:

“The shape and dimensions of other stud/cleat designs should be such that they present a no greater risk of injury to another player than the stud/cleat shown in figure 1. Tests A and B iv can be used to assess comparative performance.”

Translated: if the studs in question do not match the specifications in that diagram, the glancing/raking and stamping tests can be used “to show they don’t perform worse in terms of safety than studs that do match the diagram”.

So… they have passed the tests.



Raison d’être.

The manufacturer claims the studs deliver an extra 5%-8% benefit in pushing. The studs can be inserted in various orientations (i.e. they can be set to face different directions using some little washer gizmo) depending on whether that player’s goal is pushing, speed or stability. They say they used 3D printing to speed up prototyping during a two year development, testing the studs against artificial skin.

Smart Power told me that testing of the new stud has involved the Clermont and Brive clubs from the Top 14, who have used the new studs in training. They also said that the French and Japanese national sides are currently testing them out with more sides to follow.

Photo of the Smart Power Profiler stud, as posted on the company’s Facebook page.


The opinion bit.

The fact is that these are now legal in rugby union. But I’m laying my cards on the tablev. I am somewhat surprisedvi that these are permissible equipment on a rugby pitch.

Stamping and rucking might well be outlawed in modern rugby, but sometimes bad things happen. Bad things happening less often due to law changes does not mean that they never happen. These things have edges; one might not unreasonably call them protrusions. The risk here seems unnecessary, especially after some poor fecker wears them for a season or so of running back and forth to training and matches over concrete or tarmac.

Having said that, I again stress that they are legal in rugby union. We are told they have been independently tested. World Rugby has been satisfied of this, and the company says this has been a two year development journey. I am no physicist, no scientist, no biomechanics expert, no materials guru. I am mere journalist, sat here scratching the noggin. Just like I was when the toe stud was brought back.

But if a communication is indeed to be issued from World Rugby’s referee department about these little beauties, it might go thusly:

Dear valued Referee, while these studs might upon first glance look like the sort of thing that might once have triggered spasms of liability panic when performing the pre-match stud check, they are now, as of February 2017, completely legal.

Rugby-legal, that is. Whatever that really means.

Fuck it. I’m off to play fireball.

6 Responses to “The Mullet Stud. It’s New, It’s Edgy, And it’s Legal?”
  1. Jean Christophe MOYNET SMART POWER says:

    Hi Andy,

    Thanks for speaking about our new 3D generation studs.

    I am Jean and I am working for SMART POWER and yes as you say above ” Yes, you can buy them” now SMART POWER Profiler is World Rugby compliant and had passed World Rugby’s tests.

    The feeling of dangerousness when you see the picture of the stud can be understand because it a brand new product and when you dont know the full prototype without any test, It can maybe sqared some players. That why we are offering clubs to make some trial during match or training.

    We have really good feedback from teams and from National sides our first goal is to show to all that this product will satisfied all players backs and forwards.

    Feel free to contact me at for any informations.

    Best Regards

    Jean Christophe Moynet
    Europe & South Hemisphere

  2. MattP says:

    So how read interpreted Jean’s comment was as follows,’ Until we see how many people are hurt we don’t feel like we can truly decide if in use they would cause significant injury. So let’s test these cleats on the unsuspecting souls of the game. It’s a sad day that the quest for $$ or francs has to be born on the backs of the players in the field.
    As Andy stated, “Fuck” (well spoken by the way), these studs are probably perfectly safe if all players played the game, not the vengeful negligence of many mean spirited players. The innocence of a parking lot traverse will create edges but the willfulness of angry ‘souls’ will cost a lot of pain before the reality of the their danger is fully realized.

  3. Spinosa says:

    When they introduced the ‘new’ safety studs, all those years ago, as well as the shape being less aggressive, the edges wouldn’t get sharp from walking or scraping on concrete, no matter how hard we tried.
    Those were the days…..

  4. Adrian says:

    It is fine to say the game has no raking any more, but you are still likely to stand on someone at some stage when you get moved – has any testing been completed around forces generated if you get struck with the back part of the stud? I think it should be tested on the CEO and execs from the company if they genuinely feel it is safe.

    If the entire team wears them, Hans Blix will be on the case!

  5. Rebecca says:

    The studs should be banned immediately.My 17 yr old son had a nasty injury on his eyelid from one of his team mates studs last weekend in a school rugby match.An almost perfect impression of one of your studs.It narrowly missed his actual eye.He will have a permanent scar.

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