If you go White water kayaking, and then when you're on the water look around there's a good chance someone will be wearing a Sweet Rocker. These helmets tick my two important boxes I look for in a white water helmet, fantastically comfortable and secure and very very strong. As a bonus they also look great and keep your head nice and warm in the winter! You really cannot go wrong with this helmet.

What Sweet say 

The Rocker FC is a high performance helmet for really rough conditions. The Rocker FC is made in the best materials available and provides extended coverage for superior protection. Our team tested, high tech, neck-hugging Occigrip System provides a secure fit. Certification CE EN 1385 - Helmet for Canoing and water sports (ICF class I-IV)