When we describe our yarn as "high CSP", we are talking about strength. CSP stands for Count Strength Product, and it is one of the oldest and most practical quality checks in cotton spinning.

How CSP is measured

A lea of yarn, 120 yards wound on a wrap reel, is broken on a lea-strength tester. The breaking load in pounds is the lea strength. Multiply that by the yarn's count and you get the CSP:

CSP = Lea strength (lb) × Count (Ne)

Multiplying by count puts coarse and fine yarns on one scale, since a coarser yarn will naturally break at a higher load.

Why it matters on the shop floor

  • Fewer breaks. Higher CSP yarn breaks less often on looms and knitting machines, which means less downtime.
  • Better fabric. Strong yarn gives fewer holes and weak spots in the finished cloth.
  • Consistency. A steady CSP from lot to lot is a sign of controlled mixing and spinning.

Asking the right question

When comparing suppliers, ask for the CSP alongside the count and check that it is measured the same way. Our product listings give the CSP figure where we publish it, and we are happy to share test details for any lot on request.