It's for motorcycles, but perhaps the idea can be adapted to cyclists. Wheelman tells us about the Roof R06 Bamboo motorcycle helmet from French designer Claude Morin.
This limited edition bamboo bike helmet is made of braided bamboo fiber and meets the European E22-05 helmet safety standard.
Treehugger mentioned this last August, but I usually ignore motorcycle news and missed it. Watch for product and purchase info here.