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Mattresses, Futons and Beds
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A mattress is a mat or pad, usually placed atop a bed, upon which to sleep or lie.

Though a mattress may be placed directly on the floor, it is usually placed atop a platform (such as a bed or a metal spring foundation) to be further from the ground. Historically, mattresses have been filled with a variety of natural materials, including straw and feathers. Modern mattresses usually contain either an innerspring core or materials such as latex, viscoelastic, or other polyurethane-type foams. Mattresses may also be filled with air or water.

Spring mattress core
The core of the mattress supports the sleeper’s body. Modern spring mattress cores, often called "innersprings," are made up of steel coil springs, or "coils."

The gauge of the coils is another factor which determines firmness and support. Coils are measured in quarter increments. The lower the number, the thicker the spring. In general, higher-quality mattress coils have a 14-gauge (1.63 mm) diameter. Coils of 14 to 15.5-gauge (1.63 to 1.37 mm) give more easily under pressure, while a 12.5-gauge (1.94 mm) coil, the thickest typically available, feels quite firm.

Connections between the coils help the mattress retain its shape. Most coils are connected by interconnecting wires; pocketed coils are not connected, but the pockets preserve the mattress shape.



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Alphabetical Listings

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All American Adjustable Beds
PO Box 3846, San Rafael, CA 415 499-0901

Back Shop & Sleep Ctr
917 C St, San Rafael, CA 415 459-0499

Duxiana-The Dux Bed
901 A St # A, San Rafael, CA 415 459-0365

Eric Frey-Tempur-Pedic
1618 4th St, San Rafael, CA 415 459-6666

Green Fusion Design Ctr
14 Greenfield Ave, San Anselmo, CA 415 454-0174

Mancini's Sleep World
28 Bellam Blvd, San Rafael, CA 415 256-9800

Mary's Futon & Wallbeds
4100 Redwood Hwy, San Rafael, CA 415 472-2919

Mattress Discounters
733 Francisco Blvd E, San Rafael, CA 415 451-1806

P M Sleep Ctr
115 Bellam Blvd, San Rafael, CA 415 457-9900

Tempurpedic Showroom
1559 S Novato Blvd, Novato, CA 415 892-9299

Sleep Train
232 Vintage Way, Novato, CA 415 897-9266

Sleep Train 
530 Francisco Blvd W # D, San Rafael, CA 415 256-2538
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Types of coils

There are four different types of mattress coils:

Bonnell coils are the oldest and most common. First adapted from buggy seat springs of the 19th century, they are still prevalent in less expensive mattresses. Bonnell coils are hourglass-shaped, and the ends of the wire are knotted or wrapped around the top and bottom circular portion of the coil and self-tied.

Marshall coils, also called "pocketed coils," are each wrapped in a fabric encasement and usually are tempered, or in the case of the Simmons Beautyrest carbon magnesium is added. Some manufacturers pre-compress these coils, which makes the mattress firmer and allows for motion separation between the sides of the bed.

Offset coils are designed to hinge, thus conforming to body shape. They are very sturdy, stable innersprings that provide great support.

Continuous coils Or Mira-coils, Work by a hinging effect, similar to that of offset coils. In a basic sense a continuous coil is simply that, one continuous coil in and up and down fashion forming one row (usually from head to toe) of what appear to be individual coils. The advantages of how firm a support the continuous coil provides it is somewhat tempered with the 'noise' associated from a typical mira coil unit.

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