Customizing a Sex Doll‘s breasts typically involves several key options: breast type, material, size, areola color, and nipple size. In this guide, we will break down each customization option to help you choose the perfect breasts for your doll.
Breast Types
There are three main types of sex doll breasts on the market: Solid Breast, Hollow Breast, and Gel Breast. Below, we will compare these three options to help you better understand which one suits your preferences.

Solid Breast

This is currently the standard, default breast type on the market. They are made of silicone or high-quality TPE, depending on your doll’s base material. A Solid Breast is firm and full, offering good elasticity and softness. However, because they are solid and lack implants, they feel slightly firmer than a gel breast. If you prefer breasts with less bounce, this is a great choice. Solid breasts are generally best suited for A-cup and B-cup sizes.
(Video Demonstration: Solid Breast)
As can be seen from the video:
- The solid breast lacks elasticity and is difficult to shake when tapped.
- When poking the breasts with your fingers, you can see that the solid breasts are of a relatively soft level.
How Solid Breasts Are Made:
Liquid TPE or silicone is poured directly into the mold. Once the material cools and solidifies, the interior of the breast is completely composed of solid TPE or silicone.
Pros:
- Firm, perky, and holds its shape well.
Cons:
- Slightly less soft and bouncy compared to hollow or gel breasts.
- For those who prefer larger bust sizes, they may not provide the natural feel you expect.
Hollow Breast

A Hollow Breast is filled with air, making it softer and much more elastic than a solid breast. If you love full, soft, and highly bouncy breasts, this is the option for you. Furthermore, for users looking to reduce the overall weight of their doll—especially those opting for curvier figures with larger busts—hollow breasts are a perfect solution. However, they are more fragile and prone to collapsing; any puncture or tear in the material can lead to sagging. Because of this, they require careful handling during intimacy to maintain their sexy appearance and feel over time.
(Video Demonstration: Hollow Breast)
As can be seen from the video:
The hollow breast is more flexible and is more prone to wobbling when tapped. When poked with the fingers, they are more resilient and also very soft and knead effortlessly.
How Hollow Breasts Are Made:
During manufacturing, space for two steel balls is reserved inside the mold before pouring in the liquid TPE or silicone. Once the material sets, the steel balls are removed through a small hole on the side of the breast, leaving the inside empty to create a hollow cavity.
Pros:
- Significantly softer and more elastic than solid breasts.
- Much lighter in weight, making it ideal for dolls with large busts.
Cons:
- Prone to rupturing if squeezed too forcefully.
- Higher risk of sagging over time.
Gel Breast

This is currently the most popular breast type on the market. A Gel Breast is filled with a jelly-like gel material to ensure an incredibly soft and elastic touch. They are specifically designed to simulate the feel of real human body fat, making them the ultimate choice for highly realistic sex doll torsos. Compared to hollow breasts, gel breasts are firmer, more durable, and less likely to sag, yet they remain significantly softer than solid breasts.
The texture and movement of a gel breast are astonishingly close to those of a real woman. If you want your Sex Doll to deliver the most natural and lifelike experience, this is absolutely your best choice. Upgrading to gel breasts usually requires an additional fee (typically ranging between $70 and $100), but it is an investment you won’t regret. Gel breasts are highly recommended for C-cup sizes and above.
(Video Demonstration: Gel Breast)
As can be seen from the video:
- The gel-filled breasts are very elastic and can easily wobble when tapped. Highly resilient when poked by the fingers. Also, very soft and knead effortlessly.
- The moderately sized breasts do not differ much in appearance and all restore reality to a large extent.
How Gel Breasts Are Made:
Space for two steel balls is reserved in the mold, and liquid TPE or silicone is poured in. Once solidified, the steel balls are removed through a side hole, and an ultra-soft gel material (jelly) is injected into the cavity.
Pros:
- The most realistic breast shape, feel, and movement.
- Extremely soft and lifelike to the touch.
Cons:
- Requires an additional upgrade fee.
Breast Materials
Silicone and TPE are the two primary materials used in doll manufacturing. TPE breasts boast realistic flexibility and a lifelike touch, whereas silicone breasts tend to be smoother and firmer. The Gel Breast is unique: the gel is housed inside the breast, while the outer “skin” layer depends entirely on the doll’s base material (either TPE or silicone).
Areola Size and Nipple Color
Areola Size
EighteenDoll offers three different areola sizes to choose from: 3cm, 4cm, and 5cm.
Nipple Color
EighteenDoll recommends selecting a nipple color that closely matches the doll’s skin tone for a natural look. Additionally, most Sex Doll manufacturers provide a variety of color options to suit your personal preference.
FAQ
Q: Which breast type is the heaviest?
A: The Solid Breast is the heaviest option because it does not contain air pockets or gel implants. Compared to gel and hollow breasts, they can feel noticeably heavier. EighteenDoll recommends choosing solid breasts for A to B cups, and gel breasts for C cups and above. For sex dolls with H cups or larger, we highly recommend the Hollow Breast to keep the doll’s overall weight manageable.
Q: How do I clean and maintain my sex doll’s breasts daily?
A: Clean the doll’s skin using warm water and a mild antibacterial soap. Gently pat the breasts with a soft sponge, or wash them softly with your hands. To prevent bacterial growth, ensure you perform a deep, thorough cleaning every 2 to 3 weeks.





