How to Measure & Put On a Chastity Cage: The Ultimate Beginner’s Guide (2026)

📝 Introduction

Learning how to measure for chastity cage sizing is the most important step before buying. The #1 reason men give up isn’t lack of desire—it’s the wrong fit.

Most guides tell you to “just put it on.” They forget to mention the pinched skin, the hair pulling, and the panic of a 3 AM erection.

If you are Googling “how to measure for a chastity cage,” you want to do this safely. In this guide, I will walk you through the entire process, from measuring and shaving to surviving your first night locked up.

🛑 The “Cheat Code”: Don’t Want to Measure?

Measuring can be tricky. If you are afraid of getting it wrong and wasting money, there is a simple solution: the Discovery Kit.

Brands like Oxy-Shop sell a “Discovery Set” that includes multiple ring sizes and spacers. You buy one box, try them all at home, and find your perfect fit instantly. It’s cheaper than buying two wrong cages.

👉 Check out the Oxy-Shop Discovery Set here.

📏 Part 1: How to Measure for Chastity Cage (Step-by-Step)

You need to measure two things: the base ring (crucial) and the tube length.

Tools You Need:

• A soft measuring tape (tailor’s tape).
• Or: A piece of string and a ruler.
• Critical Rule: You must be FLACCID (soft) and preferably cold. Do not measure while hard.

Step 1: Measuring the Base Ring (The Ball Fit)

This ring goes behind your testicles, against your pelvic bone.

1. Lift & Clear: Lift your penis and scrotum up out of the way. You need clear access to the base.
2. Place: Place the tape measure at the very base of your genitals, right against the body.
3. Wrap: Wrap it around the base of the scrotum and penis combined.
4. The Squeeze: Pull it snug, but not choking tight. It should feel like a comfortable grip.
5. Calculate: Note the circumference in millimeters (mm). Divide by 3.14 to get the diameter.
   • Example: 157 mm circumference / 3.14 ≈ 50mm diameter.

Step 2: Measuring the Tube Length

1. While flaccid, press a ruler gently against your pubic bone (push into the fat pad).
2. Measure to the tip of your glans (head).
3. Decision Time:
   • Comfort Fit: Choose a tube slightly longer (+5mm) than your measurement.
   • Humiliation/SPH: Choose a tube slightly shorter (like the Oxy Micro) to keep the head pushed back.

✂️ Part 2: Preparation (Don’t Skip This!)

Ranking #1 articles emphasize this, and they are right. Skipping this leads to pain.

1. The “Manscaping” Rule

Chastity cages have hinges and gaps. If you have hair down there, it will get caught.

• Recommendation: Shave or closely trim the base of the penis and the scrotum. This prevents the agonizing “hair pull” when the cage moves.

2. The “Cold Shower” Trick

You need to be as small as possible to put the cage on easily.

• Tip: If you are nervous or semi-erect, take a quick cold shower or splash cold water on your junk. “Shrinkage” is your best friend during application.

3. Lubrication is Life

Never go in dry. Apply a high-quality water-based lubricant to:

• Your penis and balls.
• The inside of the base ring.
• The inside of the cage tube.
• Warning: Do not use silicone lube with Oxy-Shop cages (Bio-Resin), as it can degrade the material.

🔒 Part 3: How to Put On a Chastity Cage (Step-by-Step)

Putting a cage on is like solving a puzzle. Follow these steps to avoid the pinch.

Step 1: The Ring First (Ball Trap)

1. Unlock the device and separate the ring from the cage (if 2-piece).
2. Push your penis through the ring first.
3. The Trick: Push one testicle at a time through the ring. Trying to shove both at once is difficult and painful.
4. Once through, ensure the ring sits snugly behind your balls, against your body.

Step 2: The Tube Entry

1. Slide the tube/cage over your penis glans.
2. If you are using Oxy-Shop Bio-Resin, it will feel warm. If using steel, brace for the cold!
3. Push the penis all the way in until the cage meets the ring.

Step 3: The Connection & Pinch Check

This is the most dangerous moment.

1. Align the cage hinge/lock with the ring.
2. STOP: Before you click it shut, pull the skin around the connection area gently away. Make sure no scrotum skin is caught in the gap.
3. Lock: Insert the locking pin or padlock. Click. You are owned.

🛌 Part 4: Living with the Cage (Survival Guide)

Now that it’s on, how do you survive?

1. Dealing with “Morning Wood”

The first night is the hardest. You will wake up with an erection hitting a solid wall.

• The Fix: Curl into a fetal position (knees to chest). This relieves tension on the pelvic floor and helps the erection subside.
• Product Tip: Metal cages have zero give and hurt more. The Oxy-Shop Ergo Me (Bio-Resin) has a tiny amount of flex, making sleep much more bearable.

2. Hygiene & Showering

You don’t need to unlock to clean (unless you want to).

• The Wash: In the shower, pull the cage away from your body slightly and let soapy water run through the vents.
• The Dry: Use a hairdryer on the “Cool” setting to blow air through the vents. Trapped moisture causes rashes. Bio-Resin cages dry faster than metal because they don’t condense water.

3. Using the Bathroom

• Sitting Down: Until you master the aim, sit down to pee. The urine hits the end of the cage and can spray unpredictable.
• The Rinse: After peeing, splash some water on the tip or use a water bottle to rinse the cage. Urine crystals can build up and smell if left dried.

❓ Troubleshooting FAQ

Q: My skin is getting pinched between the ring and cage.
A: This is common with cheap cages. You can try applying a bit of cornstarch powder to reduce friction. However, the best fix is a better cage. Oxy-Shop’s seamless 3D-printed designs eliminate the sharp hinges found on cheap metal cages.

Q: It feels fine standing up, but hurts when I sit.
A: Your anatomy shifts when you sit. The ring might be digging into your balls. Try adjusting the “spacers” (if your kit has them) to create a slightly larger gap between the ring and the cage.

Q: I’m panicking. I can’t get it off!
A: Calm down. Panic causes blood flow, which causes swelling.

1. Take a cold shower (shrinkage).
2. Apply tons of lube.
3. Relax and breathe. It went on; it will come off.

💡 Pro Tip: Combine with Prostate Play
While being locked up creates psychological intensity, you can still enjoy physical pleasure. Many users combine chastity with anal play. Check out our guide to the Best Prostate Massagers to enhance your lockdown experience.

Or, if you have already measured and are ready to buy, see our ranked list of the Best Chastity Cages in 2026.

🧠 Final Verdict: Start Right

Mastering how to measure for chastity cage sizing is a journey, not a sprint. Don’t get discouraged if the first size isn’t perfect.

• Option A: Measure carefully and follow the steps above.
• Option B (The Smart Way): Get the [Oxy-Shop Discovery Set]. It removes the sizing anxiety and gives you multiple options for day (tight) and night (loose) wear.

Ready to lock up? Check out our review of the 4 Best Chastity Cages in 2026 to pick your device.