Soft Snowboarding Helmet

Wow, just check this out. It's a soft hat, but when it impacts something, like a tree, it'll turn hard and protect your noggin. From Live Science:

A shear thickening material, it is flexible when moved slowly, but when it is compresssed by an impact, its molecules lock together. The material stiffens, spreading the impact over a greater area. The Swiss company Ribcap is bringing out a new line of headgear for snowsports based on this material. The Ribcap is a combination soft, flexible beanie and tough helmet.

Right now, I think it's just available overseas in Europe, but if it was available here, you know I'd get one.
New Soft Helmet Turns Hard in Crash
ribcap website