I came across the EVO Blackout chastity device recently by chance while reading a post on a chastity forum. I had never heard of Blackout Devices or the Canadian company’s chastity devices. After finding the website, it delighted me to find a radically new design that I find intriguing and thought I’d share about it here.
Especially since the popularity of 3D-printed chastity devices has exploded, it is rare to find an innovative design. A couple of companies dominate the market, and the rest of the manufacturers essentially copy the designs. So, discovering the Evo by Blackout Devices captured my interest immediately. This is not a review. I don’t have this device and haven’t tried it. But the Evo has enough interesting features, I thought it was worth talking about.
Evo Basics
Fitted to You – Anatomically Designed
The Evo by Blackout Devices is a 3D-printed device made from Nylon PA12, a bio-safe material often used in biomedical components. Nylon PA12 is a smooth, lightweight plastic material with great mechanical properties. The company uses a proprietary completely parametric system (refers to a system where design input parameters get fed into algorithms) to build the device to a customer’s exact measurements. Blackout Devices claims the Evo is the ultimate custom sized chastity cage designed for comfortable, long-term wear. But that’s not all.
Unlike other chastity devices, no sizing guides are necessary with the Evo. You don’t even choose a base ring size. Instead, you provide Blackout Devices with a set of measurements (in millimeters) and the parametric manufacturing system takes it from there. More on that later in this post.
Three Different Heads to Choose From With Evo
The Evo offers not one, not two, but three head options.
One of the most frequent complaints about chastity devices I’ve seen is how those with an uncut penis have difficulty finding a comfortable device for long-term wear. Problem solved with the Evo, which offers a head (tip of cage) designed specifically for those not circumcised.
More Innovations
Getting three head style options is only the beginning with the Evo. Here are other Blackout Devices design innovations.
The company claims the unique V-shape design of the Evo Cage helps reduce erection strength and duration by not putting pressure on the deep dorsal vein and the superficial dorsal vein. This supposedly allows for less restricted blood flow unlike most cages. Instead of fighting against the cage, erections get contained and then easily subside.
The V-Prong glans ring, perfectly sized based on the customer’s measurements, grip the glans while flaccid to help maintain alignment for easy urination. The prongs also help to reduce turtling by providing an elastic structure that pulls the penis back into place. This feature is not included with the Uncut Head as testing showed it caused foreskin swelling issues.
Blackout Devices claims the ergonomic cuff-style base ring of the Evo is the most comfortable base ring on the market. Instead of the common round ring, the Evo base ring shape matches the anatomy and its waterfall edge design allows the skin to sit more naturally. The increased surface area helps reduce ball burn and discomfort during erections, while providing better grip to keep things in place.
Measuring for the Evo
Blackout Devices requires six measurements for the Evo. All measurements must be in millimeters.
1. Flaccid circumference
2. Flaccid shaft length (base to glans) measured from the top
3. Flaccid total length (base to tip)
4. Erect circumference
5. Erect total length
6. Average testicle hang (using Blackout Devices 1-6 scale)
- Halfway to a quarter inside the body
- Outside the body but with no extra hang (high and tight)
- Little to no hang
- Some amount of hang
- Fair amount of hang but no super low
- Hang well below 75mm (3 inches) with lots of extra scrotum skin
Blackout Devices strongly recommends using an old cash register receipt to measure with, using the receipt to measure length and circumference similarly to how it would be done using the “string method” some device manufacturers recommend. After measuring with the receipt and marking the measurement with a pen or marker, then use a tape or ruler to measure the distance marked on the receipt in millimeters (or convert to millimeters if you don’t have a measuring device in millimeters). The company warns accurate measurements are critical as an inaccuracy of only a few millimeters can make a significant difference in fit.
I understand the theory behind using a cash register receipt. Receipt paper by design has no stretch. It will tear before stretching. But a tailor’s tape also has no stretch. After using a receipt and a pen and then repeating the measurements with a tailor’s tape, I found no difference in the measurements and using the tailor’s tape was much easier.
The company recommends measuring at least 5 times over several days to get the most accurate results. You then submit the measurements on the website (requires registration) and Blackout Devices uses them to calculate the proper size of the cage and base ring. Click here to get a printable copy of the measuring guide.
Cost of the Evo
At the time of this post, the Evo price was $250 (USD), which seems reasonable for a custom-fitted chastity device, especially if the fit is as advertised. The price includes the cage, ergonomic base ring, and integral lock with key.
My Thoughts About the Evo
Since I haven’t tried the Evo, I can’t confirm the veracity of the Blackout Devices claims or attest to how well all the innovations actually work. But the claims seem reasonable enough that I feel tempted to order an Evo and try it out. I would like to see how well the company’s proprietary design system works.
I am a little skeptical about the base ring sizing methodology. I tried a lot of different base ring sizes and shapes before finally finding the prefect balance between comfort and security for me. And common round rings are the only type I’ve been able to use without ball slips. It’s a little difficult for me to believe the company can predict the proper base ring size based on penis length, circumference, and estimated testicles hang. I’ve seen no scientific evidence showing a correlation between penis size and testicle size. But I could be wrong. Maybe the company’s system works.
The only thing about the Evo I’m not thrilled about is the cage looks like a penis, which feels like a step back to the early CB-X days. The thing I like best about my KINK3D cages is they don’t look like a penis. Still, if the Evo fits as well and is as comfortable to wear as Blackout Devices claims, I could live with it.
As an aside, Blackout Devices also offers another chastity device called the Sport, which is designed for cyclists, runners, swimmers, and those who work out at the gym. (Not recommended for contact sports). It runs $145 for the cage, base ring, and integral lock. You can click here to learn more about the Sport.