Shopping for a mattress can get a little confusing with all of the different sizes available. Aside from standard twin, twin long, double, full and queen beds, there are two types of king size mattresses with four different names! So what is the difference between the Eastern King and the California King size mattress? If you've guessed that the California King size mattress is bigger, you're only half right!

When it comes to a good night's sleep, only one thing is important: comfort. While mattress construction goes a long way to deliver a good night's rest, an equally important factor is having plenty of room both in width and length. This is particularly true if sharing the bed with a partner.

Barring a custom mattress, the Eastern King size mattress, also known as Standard King, is the widest mattress available on the market at 76 inches wide. This is the mattress of choice for large adults or couples that want a lot of room for spreading out into their own personal space. It is 18 inches wider than a queen bed and allows each person 38 inches of room -- about the same amount of room as pushing two twin beds together would provide. The Eastern King size mattress comes with twin box springs that fit side-by-side for easy transportation. The width of this bed will require triple standard pillows or two extra large pillows. The only potential drawback of the Eastern King size mattress is that it is the same length as a queen bed, which may be too short for taller adults.

The California King, or Western King, is the longest bed on the market. At 84 inches long, it is a full 4 inches longer than the Eastern King and a good choice for people six foot tall or more. Like it's wider cousin, it comes with two half-width or twin box springs. The only drawback of this mattress is that it is 4 inches narrower in width than the Eastern King.

Eastern (Standard) King Size Mattress: 76 inches wide x 80 inches long.

Western (California) King Size Mattress: 72 inches wide x 84 inches long.

If length is more important to you than width, the California King comes out on top. If the extra length is not required, the accommodating width of an Eastern King size mattress will be appreciated. Bed sheet sets should be purchased for the correct model bed. Standard King sets will not fit a California King size mattress, as the Standard fitted sheets will be too short.

Although manufacturers will offer to make mattresses to order in non-standard sizes, finding sheet sets to fit a custom king size mattress can be problematic. One solution is to have sheet sets made for you by a local fabric boutique, though this is an expensive option. However, whether your choice is the Eastern, California, or a custom-made king size mattress, you're sure to get a good night's rest on these large, comfortable beds.