Cotton Types
Cotton is the most widely used fibre for fabric because of its strength, durability and breathability. The word "staple" refers to fiber length. When someone refers to "long staple cotton" they are referring to variety 1, 2, or 3. The longer the fiber size of a variety, the more difficult it is to grow, and the more difficult it is to process. Hence the longer the staple, the more expensive it becomes.

(The image below shows the approximate relative sizes of the fibers.)

1. Sea Island Cotton
Sea Island Cotton is in extremely limited supply, and is very expensive to grow and to process. It is typically used in very expensive men's shirts.

2. Egyptian Cotton
Egyptian Cotton was developed from stocks that originated in South and Central America. Menoufi is the most widely used variety. The highly prized Giza variety has exceptionally strong fibers about 1½" long, and is used in the best qualities of embroidery thread, and the finest cotton fabrics for sheets, down bedding covers, and duvet tickings.

3. Pima Cotton
Pima cotton is in between Egyptian Cotton and American Upland long staple in length and price. It is a very good quality.

4. American Upland Long Staple
This cotton is only "Long Staple" in comparison to American Upland Short Staple cotton. The American Upland cottons now comprise up to 90% of the worlds crop. They are much easier to grow and process, and are therefore much less costly. They are perfectly adequate for medium quality fabrics. They make poor downproof fabrics for duvets and pillows, as they will ultimately leak. They are also unsuitable for high thread count sheets, as they will feel limp and coarse after a few launderings. This is the cotton used in bargain duvets, and in inexpensive "luxury" sheets.

5. American Upland Short Staple
A less expensive version of cotton, and a very basic quality. Suitable for denim for blue jeans.

6. Asia Short Staple
Asia Short staple is very easy to grow and process, and hence makes very cheap cloth. Unfortunately, lightweight fabrics made from this cotton are very weak and limp. They wear out quickly, and launder poorly.