page_title: Tonneau
section_title: Buffeting
hierarchical_section_title: Tonneau / Buffeting
caption_attribution_description: English: A tonneau watch. Français&#160;: Une montre tonneau
context_page_description: A tonneau is an area of a car or truck open at the top. It can be either a passenger or cargo space.
  A tonneau cover in current automotive terminology is a hard or soft cover that spans the back of a pickup truck in order to protect the contents of the payload or improve aerodynamics. Tonneau covers come in a wide variety of styles that fold, retract or tilt open, and can generally be locked to secure the contents of the pickup truck bed. Tonneau covers are also used in the boating industry to cover and protect any open areas of a boat. Many of these covers are made from a waterproofed canvas material and are secured to the edges of the area to be protected with snaps.
  The older, original tonneau covers were used to protect unoccupied passenger seats in a convertible or roadster, or the cargo bed in a pickup truck. Hard tonneau covers open by a hinging or folding mechanism while segmented or soft covers open by rolling up.
  Truck or car tonneau covers also conceal and/or cover cargo or personal belongings. When the cover is pulled out, it keeps items out of the sun and provides extra security by keeping personal items out of sight.
context_section_description: As air courses over the windshield at speed, it creates turbulence as it cascades into and bounces out of the cockpit.  This condition is called buffeting, and can be an annoyance to the vehicle's occupants.  A tonneau cover reduces buffeting at all speeds.  Heat produced by a heater leaves as that turbulence exchanges the cockpit's warmer air for cooler ambient air.  A tonneau cover is capable of both retaining heat and shielding a driver from UV exposure.
caption: A Mid-20th Century Tonneau Watch by Helbros.
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