10 Year Warranty

The Crystal is one of the top models in the Four Seasons line. If you're not familiar, the Four Seasons line of mattresses by Spring Air is two-sided and each side is crafted to optimize different times of the year. There is a cooler (silk) side for spring/summer sleep and there is a warmer (wool) side for winter and fall rest. Not only do these different materials utilize temperature regulation, they provide a bit more comfort to you, when you first lie down.

Luxury Firms have become probably the most popular feel of mattress in the sleep product industry. This is because they offer the supportive feel of a firm but they also have the initial comfort foams that add some cushion to your pressure points. Each side of this mattress has three whole inches of foam between you and the coil and the density and quality of those foams can be felt immediately. 

For a stable, motionless, body contouring, cool sleep, there really isn't much that the Crystal is missing. It's manufactured in the USA (Grand Rapids, MI) and is CertiPUR-US certified as non-toxic. 

Width: Length:

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Crystal - Four Seasons Flip Mattress

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Optional Boxspring Foundation:

Other Custom Accessories

All sheet sets are hand-made of luxurious material and include the fitted sheet, flat sheet and 1-2 pillowcases. They come in a variety of solid colors, most of which are pictured here. We will call you after your order is placed to discuss what colors are available for you at this time.

*We will call you to select your sheets color before shipping.
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Mattress Scale
semi firm mattress
Approx. Height of Mattress: 12"

This Mattress Features:

CertiPUR-US certified foams are:


✓ Made without ozone depleters
✓ Made without PBDEs, TDCPP or TCEP (”Tris”) flame retardants
✓ Made without mercury, lead, and other heavy metals
✓ Made without formaldehyde
✓ Low VOC (Volatile Organic Compound) emissions for indoor air quality (less than 0.5 parts per million)
✓ Made without phthalates regulated by the Consumer Product Safety Commission


Temperature Regulating 4-Way Stretch Knit
(Wool Quilted for Winter, Silk Quilted for Summer)
2" High Resiliency Contour Foam 

Mattress(Top Side)
1" Pressure Regulating High Density Foam
1/2" Latex 

800 Individually Wrapped Coils - Foam Encased 

Mattress(Bottom Side)
1/2" Latex
1" Pressure Regulating High Density Foam

2" High Resiliency Contour Foam
(Wool Quilted for Winter, Silk Quilted for Summer)
Temperature Regulating 4-Way Stretch Knit


10 Total Years (10 full)

Crystal - Four Seasons Flip Mattress

The Crystal is a part of the Four Seasons line (by Spring Air) that utilizes two different covers; one is wool for the colder months and one is silk for the warmer ones. In addition to 'flip mattresses' being longer-lasting, this temperature regulation feature is really something unique; it's probably one of the reasons why this line of mattresses is one of the nation's best sellers. 

This mattress is a luxury firm; it has HR (High Resiliency), High Density foam and latex, atop a body contouring pocketed coil spring system. There is the customary foam encasement that reduces motion transfer. With a coil count of 800, it's high enough to provide optimal support but just low enough to be indicative of the coils being made from thicker than average metal. 

For a firm (though, not rock-hard) feel and a cool sleep, I'd recommend this model. It's completely American made, from American materials and is certified as non-toxic. (CertiPUR). 



  • Shipping or delivery of this item to most areas within the 48 contiguous states only. Delivery of this item to Alaska, Hawaii, US Territories or APO/FPO addresses will require added charges. Please call customer service for rates and availability.
  • Free LTL freight delivery to most cities in the continental US. Destination must be accessible by large truck. Some locations may have a small surcharge.
  • LTL freight service is curbside to your driveway only. White Glove is available for an extra fee.
  • For complete details, read our Shipping and Return policies.



Measure all 4 sides of your mattress and bed frame before ordering.
We recommend you order the mattress 1 inch smaller than the space it is meant to fill. This will leave extra room for sheets, blankets, and variations in production size. Some people like a larger gap to really have room for your hands to reach down and change sheets easily. Please note that production size is not guaranteed to be exact. Most models are built within ±0.5 inches but the difference can be larger, especially on innerspring models. Custom mattresses are hand made by a factory worker who will take a standard mattress, then shorten it to your size. With the way spring coils are shaped, they will not work when cut in half, so an entire row of springs must be removed to modify mattress sizes. This means your innerspring bed may not come exactly the size you order, but it would still be close.

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Common Questions

What if it doesn't fit?
We will never ship out a mattress that exceeds the size you have ordered without contacting you first to check if the extra size will cause an issue. Since these are custom made for you they can not be returned, so please be careful when taking measurements. On some bed sets, the box spring will be a different size than the mattress so you will need to measure both pieces. Also, since beds are often set up not perfectly square, you will need to measure all four sides of the bed to find the correct size. Be sure to check for boards or bolts that might protrude in to the mattress area and order your pieces small enough to fit inside of these protrusions.
What sizes are available?
Any size is available upon request but with most models you are limited to being smaller than a King mattress. If you need an odd size bigger than a King, here are some models that can be supersized. Please call us to find out what prices would be.
Can I really order any size and shape?
At this time, with only 1 exception (found here), we only distribute 4-sided rectangular mattresses with no special notches cut from the corners. The size can be as large as a king, so up to 76" wide and up to 84" long. If you need an odd size bigger than a king, please call us to find out what models are available. You can also order a custom mattress small enough to fit in a baby's crib. Mattresses are formed by rows of metal springs and since springs cannot work if cut in half, your mattress core will be sized in 1-2 inch increments. This means that if you order 47x63 it will be built between 46x62 to 48x64 but most of the time it will come within 0.5 inches of the requested size. Please let us know how precise your size must be.
What about the box spring?
It is very important to measure the size of your box separate from your mattress because in many older bed sets, the box was made slightly smaller than the mattress. The length and width of solid foundation box springs can be custom made to fit exact dimensions. The thickness can not be customized but boxes are available in several standard thicknesses ranging from 4.5-9 inches.
How soon will my mattress arrive?
Once your order is paid for, a specialist from Michigan Discount Mattress will call you on the phone to verify your sizes and delivery information. Production will then begin and usually takes 1-3 weeks. After production, the mattress will be packaged at the warehouse within 48 hours to protect it during shipping to your home. Shipping takes 2-10 days depending on the destination city. The combination of producing, packing and delivering means that you should receive your mattress within 3-7 weeks of the day you order. Our streamlined process has successfully delivered 80% of our orders within 4 weeks. If you need a more accurate estimate, or have a quicker deadline, please give us a call to discuss expediting options.