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Here it is! There's nothing worse than a sag-prone, foam-only mattress. That's why I got a Sleeping Duck Mach II. But do the Indestruct Springs really make the Mach II sag proof? I put it up against a 15 tonne steamroller to see for myself.
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Oh....I just read on the SLEEPING DUCK website that the springs aren't just about sagging. Here's a cool video about their INDESTRUCT SPRINGS and the MOTHERBOARD ZONING inside.

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