Buoy Cock Ring Sizes Explained: Small vs Medium Fit
By Tantus Inc. Good Clean Fun | Published: 2026-11-03
Category: Guias Práticos
Learn how to measure for a cock ring and choose between the Buoy Small and Medium silicone rings, with a step-by-step fit check and honest sizing trade-offs.
Quick answer
Choose the Buoy Small if your snug erect girth measures near 18 mm internal diameter or you want a tighter hold; choose the Buoy Medium if you need more room or are between sizes. Measure first, then test the fit with the step-by-step check below.
Why the Buoy's two sizes feel so different
The Buoy rings are made from soft, stretchable silicone, so the unstretched internal diameter is a starting point, not a rigid limit. The Small starts at almost 18 mm and the Medium at 22 mm. That 4 mm difference matters because silicone grips along the whole circumference; a ring that is only slightly too tight can feel much tighter once you are erect.
Both sizes are designed to keep the wearer harder for longer and to slow ejaculation by keeping the testicles down. The trade-off is that a tighter ring gives more hold but less room for adjustment, while a looser ring is easier to put on but may not stay put during movement.
When to size up or size down
Size up to the Medium if you can slide two fingers under the ring when erect, if the Small leaves deep marks that last more than a few minutes after removal, or if you feel numbness or a cold sensation. Size down to the Small only if the Medium slips off during wear or feels too loose to maintain hold.
If you are unsure, start with the Medium. The Buoy is stretchy, but the catalog does not list a maximum stretched diameter, so do not assume either size will stretch to fit every body. Treat the listed internal diameters as your primary guide.
How to measure and test your Buoy fit
- Measure snug erect girth: Wrap a soft tape measure around the base of your erect penis where the ring will sit. Record the circumference in millimeters; do not pull the tape tight. Measure at the base, not mid-shaft, because that is where the ring rests.
- Compare circumference to the ring diameter: Divide your measured circumference by 3.14 to estimate the diameter you need. For example, a 69 mm circumference is about 22 mm diameter, which points to the Medium. Use the calculated diameter as a starting point, then adjust for preferred tightness.
- Choose Small or Medium: Pick the Medium if your calculated diameter is 22 mm or more, or if you are between sizes. Pick the Small if your calculated diameter is near 18 mm and you want a tighter hold. When in doubt, choose the Medium; the catalog does not list a stretched maximum, so do not rely on overstretching.
- Do a dry run before play: Put the ring on while flaccid, then check that it sits at the base without pinching. Remove it if you feel numbness, cold, or pain at any point. Never force a ring over the testicles; the Buoy is designed to sit at the base.
- Recheck after a few minutes erect: Once erect, confirm you can slide one fingertip under the ring. If you cannot, or if the ring leaves deep marks after removal, size up to the Medium. A ring that leaves marks lasting more than a few minutes is too tight, regardless of the size label.
Buoy ring facts that affect fit
- Buoy Small Cock Ring: Small-sized Buoy has an unstretched internal diameter of almost 18 mm. This is the tighter option, so it suits wearers who want a firm hold and have measured a smaller snug girth.
Buoy Small Cock Ring - Buoy Medium Cock Ring: Medium-sized Buoy has an unstretched internal diameter of 22 mm. The extra 4 mm gives more room, making it the safer first choice if you are between sizes or new to rings.
Buoy Medium Cock Ring
