Boonie hats are some of our favorites for field wear.  Keeps the sun and some of the rain off, pairs well with bug nets, just does more than baseball caps.  Really helps a White boy catch a vibe.  The Trilam material is a lot like Goretex.  Very water resistant and breathable.  

3-Layer-Laminate
1. layer: 100% Nylon
2. layer: breathable Polyurethane membrane
3. layer: 100% Polyester
Ribbon: 100% Polyester
Cord: 65% Polyester, 35% Cotton

- water-proof, breathable
- adjustable by cord stopper
- ventilation wholes on the side
- Molle-loops around the boonie