Wood.

The best things you can do are the following:

1) Wet your hair before you go into the pool, so the hair can soak up regular water instead of chlorine water.

2) Oil definitely protects your hair....you do not have to have a grease bath, but a small amount of some kind of hair oil will give your hair a barrier against the chlorine (most professional swimmers do this almost always). If you break out from the oil, then I suggest using a leave-in conditional, it does the same thing.

3) The old trusting cap. The swim cap may not keep your hair completely dry, but it will protect it from the chlorine.

Good Luck.

http://www.livestrong.com/article/25093-…
Hikory then ash
then maple

Wood?
Ash, maple or bamboo, I think.