How about a carbon fiber skeleton?

[4891d]

...
And foam cores don't HAVE to be hard. They can be soft and lightweight. The density of foam is infinitely adjustable and can be incredibly flexible as well.
Thats where the weight savings are.

You're right.
The ... dolls and the new ... model have soft foams, yet are extremely lightweight.
JustDude did reviews on these models (... 148 cm and ... 160 cm) and reported that you can't feel the internal foam at all.

PS. I removed the brand names in my post, realizing that we're in the XY subforum.
For more details, check out JustDude's threads. His reviews are very well done.

[DollCommander]

The problem with hardness is the silicone blends that tend to get used to reduce weight, not the foam. Silicone oil content, weight and softness are all directly related. To get soft silicone you need reasonable oil content which drives up the weight. In other words, the softer the silicone is, the more it will weigh because the oil content is higher. This is why super soft silicone dolls leak lots of oil, they are super saturated with oil and weigh more.

The problem with foam is delamination, visible air pockets/voids, bunching, shifting etc. This is what they forget to mention about foam use in weight reduced dolls.

F851251-D-37-B3-4-C9-B-8110-C1-B30-F210-F70~2.jpg (5.19 KiB) Viewed 138 times

DEDA768-F-322-A-4-DE8-9524-95-FDF7-AB81-D9~2.jpg (28.92 KiB) Viewed 138 times

4-FF92294-5383-4-DC5-AF07-10-B9-C5-B5-BDE1~2.jpg (34.82 KiB) Viewed 138 times

^ this result is not worth it for reduced weight, when alternate skeletal materials can acheive comparable weight reduction without decreased softness (less oil in silicone blend) or silicone to foam delamination/voids/shifting etc. in my opinion.

file-15.jpg (94.18 KiB) Viewed 137 times

^ this photo was posted by the manufacturer as a factory photo representing their product (reduced weight foam model), so it was very likely cherry picked.

I'd love a full sized, reduced weight doll as much as everyone else but I can't spend money for results like these ^.

[Luiskjr]

Skulls are already hollow.
Sigh.

place your finger in your scalp, your forehead. Then repeat in your doll. Great Difference.
Humans have a thin layer of tissue, then its hard, bone.

Dolls have a dense layer of silicone, everywhere