CalExotics Boundless 15.25cm Harness Compatible Dildo
€24.99
CalExotics Boundless 15.25cm Harness Compatible Dildo
Silicone dildo by CalExotics, smooth and curved, with a suction cup base that sticks to any flat surface or fits in a strap-on harness. The shaft is 15.25 cm long and 2.5 cm in diameter. Use it with water-based lubricant.
Compatible lubricant: water-based. Silicone-based lubricants can damage the silicone of this product.
Temporarily Out of Stock
This product is temporarily out of stock. Check these similar alternatives:
Boundless 15.25 cm Smooth Smooth, curved with a suction cup.
This is a slim dildo, 2.5 cm in diameter, with a smooth surface and no seams. The suction cup is low and wide, at 7.5 cm, so you can stick it to a wall or the floor to keep your hands free, or wear it in most strap-on harnesses. The silicone is phthalate-free.
- Silicone
- 15.25 cm
- Suction cup base
- Harness compatible
The essentials
Boundless 15.25 cm Smooth: what you need to know before you buy
Is it for you?
Who the Boundless 15.25 cm Smooth is for, and who it isn't
It suits you if…
- You want a slim, smooth dildo with no ridges or veins.
- You want to stick it to a flat surface and use it hands-free.
- You have a strap-on harness, or plan to buy one, and want a dildo that fits.
- You want a toy with a wide base that also works for anal play.
Better look elsewhere if…
- You want a thick dildo. This one is 2.5 cm in diameter, a little less than a two-euro coin.
- You want texture. It's smooth from top to bottom.
- You prefer a realistic, penis-shaped dildo.
Size and measurements
Boundless 15.25 cm Smooth size: about the length of a BIC pen
The shaft is 15.25 cm (6 in) long, about the same as a BIC Cristal pen (around 15 cm (5.9 in)), and 2.5 cm (1 in) in diameter, a little less than a two-euro coin. The suction cup base is 7.5 cm (3 in) wide, a bit more than a tennis ball.
Measurements from the manufacturer's website.
Length, to scale
BIC Cristal pen about 15 cm (5.9 in)
This product 15.2 cm (6 in)
Medium banana about 18 cm (7.1 in)
Width, to scale
This product2.5 cm (1 in)
Two-euro coin2.6 cm (1 in)
Ping-pong ball4 cm (1.6 in)
Step by step
How to use the Boundless 15.25 cm Smooth
- Wash it before first use with warm water and mild soap.
- Apply water-based lubricant to the dildo and to yourself. For anal use, use plenty.
- To use it hands-free, place the suction cup on a flat, smooth, clean surface and press down until it grips.
- To use it with a strap-on harness, pass the dildo through the ring until the base sits flat behind it.
- Go in slowly and give your body time to adjust before going deeper.
Cleaning
Wash it before and after every use with warm water and mild soap or a toy cleaner, rinse it well and dry it with a clean cloth. Store it dry and away from other toys.
Our tips
- If you feel pain, stop.
- After anal use, wash it before using it vaginally.
- Don't use silicone-based lubricant: it can damage the silicone of the toy.
- If you notice irritation, stop using it.
What the science says
What the science says about lubricant in anal sex
The studies we cite did not test this dildo. What has been studied is the use of lubricant, which is a good idea with this toy.
Over five weeks, water-based lubricant was associated with more pleasure and satisfaction in anal sex than using no lubricant. The study looks at anal sex with a penis, not dildos.
Specifications
Boundless 15.25 cm Smooth: specifications
- Length
- 15.25 cm (6 in)
- Diameter
- 2.5 cm (1 in)
- Base
- 7.5 cm (3 in) suction cup, low profile
- Weight
- 136 g
- Material
- Phthalate-free silicone
- Surface
- Smooth, seamless
- Shape
- Curved
- Strap-on harness
- Compatible with most
- Water resistance
- Water-resistant
- Colour
- Black
- Brand
- CalExotics, Boundless collection
- Reference
- SE-2700-19-3
Questions
Boundless 15.25 cm Smooth: frequently asked questions
How big is the Boundless 15.25 cm Smooth?
The shaft is 15.25 cm (6 in) long and 2.5 cm (1 in) in diameter, with a 7.5 cm (3 in) base. The manufacturer doesn't say how much of that length is insertable.
Is the Boundless 15.25 cm Smooth suitable for anal use?
Yes. It has a 7.5 cm (3 in) suction cup base, much wider than the shaft, which always stays outside. Use plenty of water-based lubricant and go in slowly.
Can you use the Boundless 15.25 cm Smooth with a strap-on harness?
Yes. It fits most strap-on harnesses. The base is a low-profile 7.5 cm (3 in) suction cup.
What lubricant works with the Boundless 15.25 cm Smooth?
A water-based one. It's made of silicone, and silicone lubricants can damage toys made of that material. If you use it with a latex condom, avoid oils: they weaken latex.
Is the Boundless 15.25 cm Smooth good for beginners?
In terms of size, yes: 2.5 cm (1 in) in diameter is a little less than a two-euro coin. The manufacturer doesn't say how firm or flexible it is, so start slowly and with lubricant.
How do you clean the Boundless 15.25 cm Smooth?
With warm water and mild soap or a toy cleaner, before and after use. Rinse it well and dry it before storing.
Before publishing this product sheet we check that every figure is in its sources and that what it says holds up. Product sheets that do not pass this check are not published. How we verify information ›
Product sheet updated on 16 October 2026
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