StackHAT™ Made from a single piece of space age polymer, StackHAT™ has no metal or moving parts to wear out and rust. It resists extreme conditions while grease and oil simply wipe away. StackHat™ is manufactured in a variety of colors to suit the look of your rig. BONUS! StackHAT is guaranteed for as long as you own your rig.* *StackHAT is not meant to remain on the exhaust stack while the motor is running Copyright © 2001-2002 Stack Hat™ All content is protected under U.S. and International Trademark, Patent and Copyright Law.