longstaple

Longstaple refers to cotton fibers with a staple length longer than the average for conventional upland cotton. In textile terminology, longstaple cotton encompasses varieties whose fibers exceed roughly 1.25 inches (about 32 mm) in length, with particularly long fibers used in the extra-long staple category. Longer fibers allow yarns to be spun with greater strength and smoothness, producing finer fabrics. The term is widely used in marketing and industry, but definitions can vary by region and testing standard.

Prominent longstaple cottons include Sea Island cotton, Egyptian cotton (Gossypium barbadense), and Pima cotton. Sea Island and Egyptian cottons are known for very long staple lengths and high luster, often grown in specific climates such as coastal regions of the Caribbean and Nile delta, while Pima is cultivated in parts of the southwestern United States and Peru. Collectively, they are marketed as premium textiles.

Longstaple cottons yield longer fibers that form finer yarns, increasing fabric softness, strength, and drape. They typically command higher prices and are used in luxury bedding, dress shirts, and high-end apparel. However, the superior qualities can come with higher production costs and variable availability, as climate and soil conditions influence fiber length and uniformity.

Because there is no universal standard for longstaple designation, labeling varies. Some producers differentiate longstaple from extra-long staple, while others use marketing terms like Egyptian or Pima cotton. Fiber-length, strength, and other properties are measured in laboratories using tests such as the High Volume Instrument (HVI), which informs classification and quality claims.