Bison Trucker Hat Wampum $35.00 Default Title - $35.00 Quantity This product is currently sold out. Please fill in the form below if you'd like to be notified when it becomes available. Introducing the Wampum Bison Trucker. It has breathable mesh in the back as well as foam in the front to keep your head cool. It has an adjustable snap in the back and is one size fits all.