Getting the right size cage is the single most important factor in whether you'll actually wear it consistently. Too big and it's insecure, uncomfortable, and defeats the purpose. Too small and you'll take it off within hours because of pain or circulation issues.
Most people get it wrong on their first try. Here's how to avoid that.
What You're Actually Measuring
There are two measurements that matter: cage length and ring size. Everything else (gap spacing, lock position, etc.) is either fixed by the manufacturer or adjustable.
Cage length is the internal length of the tube or cage that holds your penis. You want this measured while flaccid and ideally after a cold shower or some time in a cool room — you're measuring your resting state, not your most compact or most stretched.
Take a ruler or flexible measuring tape, place one end at the base of the penis (where the shaft meets the body), and measure to the tip. That's your flaccid length. Your cage length should be roughly equal to or slightly shorter than this measurement.
Why slightly shorter? Because a cage that's a tiny bit snug prevents your penis from moving around inside it, which reduces chafing and makes the whole thing more comfortable. If there's empty space at the end of the cage, you'll feel it shifting and pulling all day.
Ring size is the diameter of the ring that goes behind your testicles and around the base of the shaft. This is the part that holds the entire device on your body, so getting it right is critical for both comfort and security.
To measure, use a piece of string or a flexible measuring tape. Wrap it around the base — behind the testicles and over the top of the shaft, right where it meets the body. Measure the circumference, then divide by 3.14 to get the diameter.
Most cages come with multiple ring sizes. If you're between sizes, try the larger one first. You can always go smaller once you know what's comfortable, but starting too tight can cause real problems.
Common Sizing Mistakes
Measuring while aroused. Your cage needs to fit your flaccid size, not your erect size. The whole point is that erections are restricted. If you measure while hard and buy a cage that fits that measurement, it'll be way too big when soft.
Going too big "for comfort." This is the most common mistake. A cage that's too big moves around, pinches skin in the gaps, and can actually be pulled off without the key. Counterintuitively, a properly snug cage is more comfortable for daily wear than a loose one.
Ignoring the ring size. People obsess over cage length and forget that the ring is what's keeping everything in place. A perfect cage with the wrong ring size will either cut off circulation (too small) or slide right off (too big).
Not accounting for shrinkage over time. After wearing a cage consistently for a few weeks, most people notice that their flaccid size decreases slightly — the body adapts. If you're planning on long-term wear, you may eventually want a slightly shorter cage than what fits perfectly on day one.
Size Guide for the Anchor Cage
The Anchor Cage by LockedFans comes in three cage lengths, all with multi-size base rings included so you can find your ideal ring fit without buying multiple devices.
Small (1.57") — Best for those who measure under 1.6" flaccid, or experienced wearers who prefer a compact, snug fit. This is also a good choice if you've been wearing a cage for a while and have noticed natural size reduction.
Medium (1.77") — The most popular size and a safe choice for most people. If your flaccid measurement is between 1.5" and 2.0", this is likely your best starting point.
Large (1.97") — For those measuring above 1.9" flaccid. If you're on the larger side or prefer a slightly less restrictive fit while you're getting used to wearing a cage.
The First Week
Regardless of what size you choose, the first few days will require adjustment. Here's what's normal and what's not:
Normal: Mild awareness of the device, occasional pinching that resolves with repositioning, some difficulty finding a comfortable sleeping position, needing to sit to urinate.
Not normal: Persistent sharp pain, numbness or tingling in the testicles or tip, skin that turns dark purple or white, any sensation of restricted blood flow. If you experience any of these, remove the device immediately. It's either the wrong size or positioned incorrectly.
Give yourself at least three to five days of daytime-only wear before committing to overnight sessions. Your body needs time to adapt, and rushing it is the fastest way to turn yourself off from the whole experience.
When in Doubt, Size Down
If you're genuinely between two sizes and can't decide, go smaller. A slightly short cage is more secure, more comfortable for daily wear, and easier to maintain hygiene with than a cage with extra room. The only exception is the ring — when in doubt on the ring, go larger first.
The Anchor Cage comes with three sizes and multi-size base rings so you can dial in the perfect fit. Find your size →