Twin and Twin XL
Although you can certainly get smaller sizes (and some people will even call smaller sizes a twin), a 38×75 is generally known as a twin. It’s among the smallest sizes of mattress. A twin is usually used for toddlers or children. Because of its small size and minimal space requirements, a lot of homes use twins in smaller rooms.
If you are looking for something that is narrow but doesn’t compromise on length, then the Twin XL is a good bet. It matches the king size mattress in length, but has the same width as the twin. This makes the Twin XL a great choice for single people and places like dorms. You often see this size in summer camp mattresses found in cabins where space is often at a premium. You can even buy twin XXL mattresses which are perfect for tall people. These would fall under the category of extra long mattresses.
Queen
This is one of the most popular sizes of mattress. Couples often opt for the flexibility of this mattress’s size. It can accommodate 2 adults. One added benefit of choosing a queen size is that because it is popular, sheets and toppers are often much less expensive and easier to find than they are for bigger mattresses.
For most couples, this is the ideal size for a mattress. It fits into most bedrooms, and depending on what materials are used when it’s made, it’s generally an easy size for moving around.
King and California King
King sized mattresses are relatively recent on the mainstream scene. A lot of people opt to have 2 Twin XLs put together, instead of buying a single king mattress. Kind Mattresses come in a variety of sizes, but the 2 most popular sizes are the standard king and California king. If you are really tall, then the California king size is a good bet at 84 inches Larger sizes (both width and length are available from custom mattress manufacturers.
There are several potential negatives to consider with king-sized mattresses. They are difficult to transport and maneuver, whether that be when they are inside the house, or when moving to a new house. Accessories for king-sized beds (sheets, toppers, etc.) can be more challenging to find, as well as expensive.
Overall, many people who are used to king-sized mattresses really come to love the space they have, and some doctors even will recommend king-sized beds for the best undisturbed sleep.