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. 

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Crystal - Four Seasons Flip Mattress

$1,217 for 30 x 65 mattress
free shipping
Optional Boxsprings:

Other Custom Accessories

All sheet sets are hand-made of 100% cotton and include the fitted sheet, flat sheet and 1-2 pillowcases. They come in a variety of solid colors, as pictured here. We will call you after your order is placed to discuss what colors you would like.

*We will call you to select your sheets color before shipping.
free shipping

Mattress Scale

Approx. Height of Mattress: 12"

This Mattress Features:

CertiPUR-US certified foams are:

CertiPur-US ✓ 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 Back Supporter System

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)

Expert Review:
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). 


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  • Free shipping or delivery of this item to 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.
  • Some mattresses and accessories will ship via FedEx or USPS, otheres will use a freight service.
  • Free LTL freight delivery to most areas in the continental US. Destination must be accessible by large truck. Some locations may have a small surcharge.
  • Delivery service is to your driveway or parking lot only. White Glove is available for an extra fee.
  • If you have any special deadlines or delivery requirements, please give us a call to review options.
  • For complete details, read our Shipping 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.

Common Questions About Ordering Custom Size Mattresses

What if it doesn't fit?
We will never ship out a custom mattress or boxspring that exceeds the size you have ordered without contacting you first to check if the size variance 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 in the corners for boards or bolts that often protrude in to the mattress area, and order your custom mattress and custom boxspring small enough to fit inside of these protrusions.
What sizes are available?
Any custom size is available upon request but with most models you are limited to being smaller than a King mattress. If you need a custom size bigger than a King, here are some models that can be supersized. If you don't see your size listed, please call us to find out what prices would be.
Can I really order any size and shape?
Yes, we are able to make some of our models in odd shapes (like cut or rounded corners) for antique beds, RVs, and even boats; however most of them can only be done in a 4-sided rectangle. Here is a model that can be made in any shape. You can call us to order by phone, or just select your approximate size, place the order online, and we will definitely give you a call back to discuss you exact shape before we start building anything.
We recommend you order your custom mattress 1-2 inches smaller than the space it is meant to fill. This will provide extra room for tucking in sheets and blankets.
Our online shopping lets you select a model to the nearest inch but most of the time we can even do half-inch increments for a perfect fit. We call ALL of our online buyers before we start building anything. This allows us to discuss your exact size and make changes before production begins. This lets you buy online now without fear of getting the wrong size.
What about the boxspring ?
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 a solid foundation boxspring can be custom made to fit exact dimensions. The thickness can not be customized but boxes are available in several standard thicknesses ranging from 2-9 inches.
How soon will my custom size 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 custom mattress will be packaged at the warehouse 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 custom mattress within 2-6 weeks of the day you order. If you need a more accurate estimate, or have a quicker deadline, please give us a call to discuss expediting options.

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Michigan Discount Mattress

10 Year Warranty