Blue Dual Density Silexpan Dildo 7" (17.6 cm) — Model 1

A dildo that changes behavior depending on temperature

The Model 1 by SilexD is part of the brand’s dual density dildo range filled with Silexpan, a patented shape-memory material that reacts to heat. The outer layer is made of super soft silicone — smooth, soft, and realistic to the touch. The inner Silexpan core is firmer and gives the dildo its structure while adapting with temperature.

The principle is simple: at room temperature, the dildo feels firm. As it warms up against the body, it becomes softer and more flexible, following internal curves with an organic feeling that classic dildos do not reproduce. This is what SilexD calls Thermo Reactive technology.

With 17.6 cm of insertable length and a 4.7 cm diameter, the 7" Model 1 is a mid-size format suited to regular users. The design is realistic, with a detailed head, raised veins, and a base with balls.

What exactly is Silexpan?

A shape-memory core. Silexpan is a material developed and patented by SilexD. It fills the inside of the dildo and acts like a flexible skeleton. When cold, it is firmer and gives the dildo more structure. When warm (from body contact or after running it under hot water), it softens and bends slightly under pressure, like a real erect cock.

True dual density. Many dildos claim to be “dual density” but are really just two layers of silicone with different firmness levels. Here, the Silexpan core and the super soft silicone outer layer create a real contrast: firm in the center, soft on the outside. When you squeeze the dildo between your fingers, the silicone gives while the core resists — just like an erection.

Thermo-reactive. You can play with temperature: run the dildo under warm water before use for a softer start, or leave it at room temperature for a firmer, more direct penetration. During use, the core gradually warms up from body contact and becomes softer as the session goes on.

How to use it

Apply water-based lubricant to the dildo and around the penetration area. The super soft silicone surface is smooth and holds lubricant well — reapply if needed.

If you want a gentler insertion, run the dildo under warm water for 2 to 3 minutes before starting. The Silexpan softens and the dildo becomes noticeably more flexible. For a firmer, more directed penetration, use it at room temperature.

The realistic design with a defined head allows for a natural insertion. The 4.7 cm diameter is substantial — take your time for the first insertions and never force it. The base with balls acts as a safety stop and offers a good grip for handling.

The Model 1 is waterproof IPX8 — you can use it in the shower, in the bath, or fully submerge it without any problem.

Enhanced realism solo and with a partner

Solo, the Model 1 offers an experience closer to realism thanks to the dual density + thermo-reactive combination. As you use it, the dildo warms up and gradually softens, changing the sensations as the session continues. That is something classic silicone dildos — which always keep the same firmness — do not provide.

With a partner, the realistic look and feel of the Model 1 make it a strong option for manual penetration. The ball base may also be compatible with some open-ring strap-on harnesses — check compatibility with your harness first.

Cleaning and care

Silicone is non-porous and hypoallergenic. Wash the dildo with warm water and mild soap after every use. The IPX8 waterproof rating means you can rinse it under running water without hesitation. You can also sterilize it in boiling water for 3 minutes.

Lubricants: water-based only. Silicone lubricants are not compatible with the dildo’s silicone.

Store it in a fabric pouch, separate from your other silicone toys.

Technical sheet

FAQ — Your questions, our answers

Q: Can you really feel the thermo-reactive effect?

Yes. The difference between the dildo at room temperature and after 2 to 3 minutes under warm water is obvious. The Silexpan core goes from structured firmness to a softness that feels much closer to an erect penis. During use, the warming effect from body contact is more gradual, but it is real.

Q: Is it suitable for anal use?

Yes. The base with balls prevents it from slipping in too far. The 4.7 cm diameter is substantial, so it is best suited to users who already have anal experience. The dual density design makes insertion more comfortable than a hard dildo of the same diameter.

Q: Is it harness-compatible?

The ball base may work with some large open-ring harnesses. It is not a classic flat base, so check compatibility with your specific harness before buying.

Q: Is Silexpan like TPE?

No. Silexpan is a patented material that is different from TPE. It is enclosed inside non-porous silicone, which makes it more hygienic than classic TPE dildos, since TPE is porous. The Silexpan core never comes into direct contact with the body.