Hexo 3D-printed bike helmet promises better fit, increased safety and less heat

And yes, as mentioned, the helmet doesn’t utilize any foam. Cook noted that regular expanded polystyrene (EPS) foam not only hardens on impact, but it’s also designed to absorb energy across a uniform, flat contact area … not a curved area, like a head. Additionally, given that it’s an insulator, it’s not good at conducting body heat.

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