Welcome to the forum. My XY Doll has a silicone head on a TPE body. The inside of her head is a bigger diameter than the neck which leaves a gap big enough to get my fingers in. Only really visible if you are looking from the floor upwards if she is standing. More noticeable round the back because if you look from the front you can't actually see her head cos her tits are in the way.
I've always assumed its because the 2 materials dont really get on with each other if left touching for a prolonged ammount of time.
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