
You may see the breast style selection in the page, it generally contains three options: Gel breasts, hollow breasts and normal breasts.
The difference between gel breasts, hollow breasts and normal breasts
Normal breasts: The normal breasts are full filled with TPE material or silicone.
Hollow breasts: The hollow breasts of sex doll are hollow, but hollow part does not exceed half of the total breast volume, which helps make the breasts softer.
Gel breasts: The inside of the breast is filled with a small piece of gel, which makes the breast more elastic.

Which is softer, Hollow breasts or gel breasts?
Generally speaking, hollow breasts are softer, but long-term use of hollow breasts dolls may cause breasts deformation.
For adult-sized sex dolls, their breasts are usually larger, which also means that they are filled with more TPE or silicone, so the breasts will become stiffer. Using hollow breasts can make the breasts softer.
For small dolls, the difference between hollow and gel breasts is not obvious. For flat chested dolls, you don't have to choose these breast options. They don't make any difference.