The hourglass shape is referring to the rounded corners on the padding, as opposed to being squared off like baby diapers. If you lay a diaper out open and flat, the padding will make an hourglass shape like a number 8. If you lay out a baby diaper, or a SDK V1, the corners squared off don't look like an hourglass. Both have padding extending into the wings to some extent, so both are sort of "contoured".
Just wanted to clear up what people are referring to when they say hourglass
The hourglass shape totally takes away from the baby diaper look and makes it look more like a medical diaper.
RG
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