Solid Breasts:
Solid breasts are also called standard breasts. They are filled with premium TPE or silicone materials. These breasts are firm yet flexible, and still have the softness and elasticity that premium TPE and silicone materials have. If you are not too picky, there is no need to upgrade them, the solid breast option is realistic enough.
Note: If you want to have breasts made of silicone, you must choose a silicone doll body.
Hollow Breasts:
Hollow breasts are breasts filled with air, not TPE or gel. They are more realistic and very soft. It is an amazing feeling to hold these breasts and watch them bounce mercilessly. There is no extra cost to upgrade. If you really like a pair of super soft, light and flexible breasts, this is a good choice. If you want a chubby sex doll with huge breasts, you can choose hollow breasts to reduce the weight. But if you are too obsessed with heavier breasts, this may not be for you.
Hollow breasts are easily damaged, and they will sag if broken.
Gel Breasts:
Gel breasts are the best choice for realistic sex doll breasts. They are soft like hollow breasts and firm and perky like solid breasts. Gels are also used on real women and most closely mimic the feel and movement of real breasts. They are soft and won't sag easily. If you like the most realistic sex doll breasts, gel breasts are a worthy upgrade.
Note: Only some brands have gel-filled breast options.