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There are three different types of lumbar supports. There is a bar that raises straight up, like the Symphony Sleep ES600. There is a whole section that raises up edge to edge, which the Rize Contemporary IV has. There is a bar that raises up by pushing forward, which the Beautyrest Black Luxury has.
Edge-to-Edge Lumbar: The edge to edge lumbar goes all the way to the edge of the base.
Bar Lumbar: The bar lumber has a bar that rises and lower the lumbar area of the back.
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