Holy Trainer v3 Nub review

I’m placing this review behind a jump since it’s filled with NSFW images of a teeny-tiny chastity device doing its job…

There’s a concept in evolutionary biology known as Cope’s Rule that says organisms tend to increase in size over time. I was thinking of that — or rather, the inverse of it — as I was pondering how to review the Holy Trainer v3 Nub. You see, in the…oh, god…more than ten years I’ve been wearing male chastity devices, they have been evolving into decidedly smaller things. Downright tiny, even. And now, here we are at what is perhaps the most extreme version of such small devices. At least, the most extreme I’m aware of. The most extreme I can conceive of. A device so wee that terms like “tube” and “cage” don’t seem to make sense. It’s more of a cup. A tiny, little penis head-sized peanut. But, it’s where we are and, in ways I never would have predicted ten years ago, it totally works.

I’ve felt for a while that smaller devices are better for most men. And I think the fact that most popular mass-produced devices now come in smaller sizes shows that a lot of people feel that way, too. In my experience, the closer a chastity device tube is to the actual size of one’s erection, the less comfortable it is. But what about nearly non-existent tubes? Tubes that aren’t much bigger than the head of a penis? Um…yeah. Actually. Even them.

Snug as a bug

In 2017, I reviewed a similarly tiny device I dubbed Micro (it’s a super cheap, anonymously produced steel Chinese piece that doesn’t have a name as such). That device is very simple: A base ring with a small cap held on by an integrated brass cylinder lock. While not uncomfortable, the Micro has at least two downsides. First, it’s impossible to pee standing up while wearing it. The cap has one hole smack in the middle and a bunch of smaller holes surrounding that, while urinating, approximates a sprinkler head. Second, the central hole is just big enough to push a little nubbin of penis flesh through and, since there are so many nerve endings in that part of the body, a little nubbin is more than enough to cause a lot of sensation (usually not good) when rubbing against underwear or the inside of pants, etc. A third more subjective issue with the Micro is that while the penis is attempting erection, it ends up with a bit of shaft showing behind the base ring. As someone who prefers to see and feel zero exposed penis, that’s a negative.

The Nub fixes all these issues. The opening of the tube lines up perfectly with the opening of the urethra and presents it forward rather than down. I wore it for this review over several weeks and peeing just worked. And not like with the Steelheart where the urine trickles out the end thanks to gravity. Peeing through the Nub is the only time I’ve ever been in chastity and had what felt and even sounded like a natural experience. I literally did nothing at all and it worked as expected 98% time. Just like a real boy.

It just works.

Not only is the opening seemingly always in the right place, there’s a slightly raised lip around it that protects the tip of the penis from making contact with surfaces like underwear or the inside of pants. I have barely felt any contact with the tip. Even when going commando, which is something I could never do in the Micro, I was pleasantly surprised by the lack of sensation. Same goes in bed from sheets. Not even while laying on my stomach. It’s a tiny and thoughtful design feature that makes me think this is a device made by those who actually wear chastity devices and who care about other men who do.

The other area where the Nub is better than the Micro is in concealing its contents, in both their squishy, flaccid state and when straining. The secret to its success is, I think, due to the unique tube flange that all Holy Trainer sizes have that protrude behind the base ring. I’ve seen some guys say they can’t wear HT devices due to this flange, though it’s never bothered me. Until the Nub, I haven’t understood why it was there so I can’t tell if the way it works on the Nub is the way it was intended to or if it’s a happy accident. In any event, unlike with the Micro where the penis is essentially squished down like a springy snake into a novelty can of nuts, the flange on the back of the Nub catches the loose skin on the shaft. I’ve made an animated GIF to demonstrate this. Pardon the dry skin. Winter is long north of the wall.

Hot flange action

As I said, the Nub tube is the only Holy Trainer size in which this flange interacts with my body like this so I can’t know if it’s an intentional aspect of the design but the result is an incredibly snug and secure-feeling fit that makes the Nub feel more integrated into me than any other device I’ve worn.

So much so, that it basically turns the penis into an internal organ. The entire shaft, whether flaccid or hard, remains inside my body and after a while I felt like I didn’t even have a penis. In one of the images above, you can see how when hard the erection manifests as a sort of lumpy bulge behind the Nub. During very intense erections, the shape of it can be seen in the bulge, but the entirety of it remains inside.

Belle and a lot of people on Twitter assume the Nub is painful and uncomfortable, especially when it’s containing an erection, but nothing could be further from the truth. It’s incredibly comfortable, even when the penis is trying to be erect. Unlike most other trapped-ball devices I’ve worn (maybe all trapped-ball devices I’ve worn), the Nub doesn’t pull against my balls when containing an erection. There’s no testicle pain from the tightness of the ring because the thickest part of the erection doesn’t go through the ring. Just the head.

Low profile

From a stealth perspective, the Nub excels. Unlike the Micro which created an almost inverted bulge when seen through clothing, the Nub’s presentation looks very natural, though the bulge it makes is nearly entirely made up of my balls.

Nothing to see here. Move along.

Hygiene can be tricky in this device. It’s so sung and integrated with its contents that it can be difficult getting soapy water behind it. I will just as often than not withdraw the penis from behind to make it clean and then reinsert it. Yeah, that’s not ideal, but it’s the most efficient. I’m sure one could keep it clean enough without doing that, though. Since I have a PA and the piercing goes empty while I’m in the Nub, I do get extra leakage of urine that gets trapped behind the plastic. My assumption is men without extra holes in their penises would find the Nub to be very hygienic.

And yeah, as snug as it feels, it’s no more secure than any other trapped-ball device that’s not fixed with a PA or some other piercing. Alas. But it feels very secure and that’s half the battle.

In summary, I think the Nub is a terrific male chastity device. It’s effective and creates almost no discomfort. While I greatly prefer steel and devices with the absolute security of a PA fixing, the Nub is a device I could (and have) worn for weeks at a time. It’s become my go-to travel device. For those seeking a device that maximally minimizes its contents, the Nub should definitely be considered.

18 thoughts on “Holy Trainer v3 Nub review

    1. That’s a good question that, being cut myself, I can’t answer fully. I would think it’d be OK, but it would probably make getting everything squished in there harder.

  1. Thank you for such a good review. I’m considering purchasing one myself but was concerned about “fitting” inside. I’m an average sized male and just don’t want to spend the money and not be able to use the nub.

  2. I’ve been wearing it instead of the metal Micro device. It IS very comfortable indeed, peeing is not a serios issue.
    I love it.
    But there is a disadvantage: it is not (yet) available as a stainless steel version and it is not (yet) available as a urethra-friendly plug or adapted version. I love this kind of equipment very much which can prevent, if long enough, a pullback of the penis. I use a corkscrew-plug instead, but that makes it necessary to remove the cage for cleaning.
    You want to try? Check Ali or DH and then get the original pretty pricey one.

    1. I just learned(info from the distributor) that there is not going to be an original Nub as stainless steel version. So it is going to be hay day for clonemakers…

  3. What is the color of the Nub that you are wearing: black or translucent black?
    Apparently black is standard, but translucent black is an extra-cost option. I’d like to be able to see a bit of what’s going on “under the hood,” but dark enough so that it is unmistakable that I’m locked in a chastity device. That leaves me with something between clear and solid black: hence my interest in translucent black.

    1. I bought a Chinese version and it was delivered today (just over a week from ordering so not bad) , tried it on earlier for an hour and have to say is was incredibly comfortable to wear.

  4. Thanks for the detailed review, which a review by Caged Lion confirms. He found a Chinese version for about $35. You say it’s become your go-to travel cage–you haven’t had any trouble getting through airport security wearing it? Have you done it multiple times?

  5. Thanks to this review I purchased mine from DHGate which arrived yesterday (10 days after I ordered) and today I am wearing it for the first time. Coming from the CB6000s whose base ring is way easier to assemble, The Nub presented a challenge at the beginning but once the base ring fitted behind my balls the cage came in place easily. It is surprising to see the penis almost disappear above your ball sack. One thing to say, so far is way more comfortable than the CB6000s.

  6. When I get an erection in this specific device, my penis has not resisted the device and then receded inside my body but rather it pushes the whole device forward. I have gotten the next ring size smaller, tested with the erection, and it still pushes the whole device forward and it looks nothing like what you have shown about it going back inside you. I was using lube at the time and I was really surprised because I was even able to “pop” out of my device with a strong enough erection (without using my hands). I think I am going to stop using lube to prevent the device from pushing forward so much and from it popping out. I still do not know how you keep the ring so close to your body. Fantastic review by the way. I was really intimidated by the size of the nub but you are right, it is super comfortable. It feels more secure but I am unsure if it is actually more secure. Either way, it is a step up from the “small” size IMO.

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