A shirtless man in dark trousers stands in a fitting room at night, a yellow tape measure hanging round his neck.

Perfect FitSheet 1Not to scale

Made to measure.

Pull the tape

Perfect Fit sizes a cock ring in tenths of an inch and moulds the number into it.

Find your number

How to measure

Around, not across.

You measure around. The ring is numbered across. Wrap a soft tape around the base of your cock, read it, and the table turns it into a number: 5.3 inches around is a #17, which is 1.7 inches across.

A tailor in a waistcoat wraps a yellow tape round a bearded, shirtless man’s chest. Both are grinning.
  1. Soft

    Measure while you are soft. That is how a ring goes on.

  2. Around

    Wrap the tape around the base, where the ring will sit. For a cock and ball ring, that is behind your balls.

  3. Match

    Find what you read in the table below. That is your number.

These rings barely stretch, so the number matters.

The tape on this page is a drawing, not a ruler, so do not hold anything up to the screen. Use a soft tape measure. No tape? Wrap a strip of paper around, mark where it meets, and lay it against a ruler.

Xact Fit ring gauge

Find your number.

Slide the brass cursor to what you measured around. The ring that matches lights up, with its number and the kit it comes in.

Slide to what you measured around

Fitting ticket

17

across
1.7 in (43 mm)
around
5.3 in (135 mm)
Comes in
Ring Toss Kit, or the 3 Ring Kit in Small Medium Large or Medium to Large
  • Snug and even is right. If it slides, go down a number. If it bites, pinches or tingles, go up.
  • Smaller numbers usually sit around your cock alone. Larger ones go around your cock and balls.
  • Not sure? Start with the Small Medium Large kit, then buy the close run around the ring that fits.
  • If #19 is still tight around your cock and balls, or you land between two numbers, an adjustable ring is the better type. Those are in the next chapter.
A tailor’s bench from above: a coiled yellow tape, calipers, shears, chalk, a tin of pins, pinstripe cloth and pattern paper.
The whole size table
RingacrossaroundComes in
#111.1 in (28 mm)3.5 in (88 mm)Ring Toss Kit
#121.2 in (30.5 mm)3.8 in (96 mm)Ring Toss Kit
#131.3 in (33 mm)4.1 in (104 mm)Ring Toss Kit
#141.4 in (35.5 mm)4.4 in (112 mm)Ring Toss Kit, or the 3 Ring Kit in Small Medium Large or Small to Medium
#151.5 in (38 mm)4.7 in (119 mm)Ring Toss Kit, or the 3 Ring Kit in Small to Medium
#161.6 in (40.5 mm)5.0 in (127 mm)Ring Toss Kit, or the 3 Ring Kit in Small to Medium
#171.7 in (43 mm)5.3 in (135 mm)Ring Toss Kit, or the 3 Ring Kit in Small Medium Large or Medium to Large
#181.8 in (45.5 mm)5.7 in (143 mm)Ring Toss Kit, or the 3 Ring Kit in Medium to Large
#191.9 in (48 mm)6.0 in (151 mm)Ring Toss Kit, or the 3 Ring Kit in Medium to Large
#202.0 in6.3 in3 Ring Kit in Large to X-Large or Small Medium Large
#212.1 in (53 mm)6.6 in (168 mm)3 Ring Kit in Large to X-Large
#222.2 in6.9 in3 Ring Kit in Large to X-Large

Medium was never a measurement.

A short length of yellow cloth tape with a brass end lies across chalk-marked charcoal wool, beside two steel pins.

Sheaths

Let it out a little.

A sheath is a soft sleeve you wear over your cock when you top. It adds girth for him, the tip is closed, and a loop behind your balls holds it on. Most are textured inside, which is for you. Perfect Fit sizes them by erect length, measured along the top of your cock from base to tip.

A hand draws a chalk line along a steel rule on charcoal wool, brass pins beside it.

Alteration ticket

Pick the length closest to your cock when hard

+0.5 in aroundThe Thin adds half an inch of girth, whatever the length. The Micro Ribbed and the Checker Plate both add noticeable girth.

A sheath is not a substitute for a condom, and SilaSkin is not compatible with latex. Water-based lube only, inside the sheath and out. Do not size down: the tip is closed, so if you are longer than the sheath it pushes back rather than gives.

Ball stretchers

The hang.

A ball stretcher holds your balls low and keeps a steady tug on them. These three are all soft. This is how much each one takes.

3/4 in stretch Bull Bag 3/4 1.5 in stretch Bull Bag 1.5 2 in tall SilaSkin
Dimension lines drawn to one scale. Not life size.
A shirtless man on the fitter’s platform, seen from behind, smiling at his reflection in a three-panel mirror.

Start soft, with a little water-based lube. Stretch the opening wide, ease it over, let it close above your balls and check nothing is pinched. Take it off after about 30 minutes, and right away if you feel numbness, coldness or pain.

Strap-on and tunnel plug

Also on the bench.

Two more things Perfect Fit sizes properly: a strap-on by your waist, and a plug by how far around it is.

A shirtless man in belted dark trousers holds a yellow tape across his own waist with both hands.

Zoro strap-on

A soft silicone dildo moulded onto a plate that snaps to an elastic waistband. No harness to buckle. Your cock goes through the opening under the shaft, so you can top him with the dildo alone or give him both at once. Two at once is a conversation first, then a lot of lube.

6.5 in insertable. 1.6 in wide at the tip, 1.4 in along the shaft. Two waistbands in the box.

Materials and care

The cloth.

Four materials, and they do not all want the same treatment. Know which one you are holding.

Two hands fan out a riveted swatch book of dark cloth under a brass lamp.

Tap a swatch

SilaSkin
Perfect Fit’s soft, very stretchy blend of TPR and silicone. The Fat Boy sheaths, the Stackit, the Cruiser, the Triple Donut and the SilaSkin Ball Stretcher are made of it. Water-based lube only: other lubes shorten its life. Not compatible with latex.
PF Blend
Stretchy like TPR, durable like silicone, and clear. The Tunnel Plug is made of it. Water-based lube only, and keep it away from latex.
Silicone
The Xact Fit rings are plush, soft touch silicone: firm, with only a little give. The Hefty Wrap is silicone too, and non-porous, so it cleans easily.
Neoprene
The snap ring. Soft, stitched, and it gives a little.

Care

  • Mild soap and water after every use. Dry it fully.
  • Water-based lube. On SilaSkin, PF Blend and the Speed Shift, nothing else.
  • SilaSkin and PF Blend are not compatible with latex. Keep them apart.
  • Store each toy on its own, in a soft cloth or a pouch.
  • Rings and stretchers come off after about 30 minutes. Right away if you feel numbness, coldness or pain.

The Speed Shift’s rubber is porous: store it apart, and use a condom if you share it. The Checker Plate is porous too, so keep it as your own.

Questions

Fitting notes.

What guys ask before they buy a ring by its number.

How do I know it fits?

Snug and even, all the way round. If it slides, go down a number. If it pinches or tingles, go up. A ring should never hurt.

How long can I wear a ring?

About 30 minutes, then take it off. Take it off right away if you feel numbness, coldness or pain.

Can I sleep in one?

No. Never sleep in a ring, and do not wear one if you might nod off.

I am between two numbers.

Then stop counting and set it by hand. The Speed Shift has 17 settings, about 0.2 in apart, and you can tighten it while you wear it.

How do I get a ring on and off?

Start soft, with a little water-based lube on you and inside the ring. Balls through one at a time, then your cock. To take it off, ease your cock out first, then your balls.

Do sheaths replace condoms?

No. A sheath is not a substitute for a condom. SilaSkin is not compatible with latex either, so do not pair the two.

What lube do I use?

Water-based, on everything here. Other lubes shorten the life of SilaSkin.

Your ring size is now a number, not a vibe.

An empty fitting room after hours: a three-panel mirror on a platform, bolts of cloth, a white shirt over a chair.
Two men laughing forehead to forehead, one shirtless, one in an open white shirt with a tape measure round his neck.

Measured. Now pick.

You have your number, your length and your hang. Everything Perfect Fit makes is on one page.

Perfect FitEnd of sheetNot to scale