the number of threads per inch in each direction, with the warp mentioned first, and the fill second, (e g , a thread count of 20 x 10 means 20 threads per inch [25 4mm] in the warp and 10 threads per inch [25 4mm] in the fill direction)
Measured by counting the number of threads per inch in the woven fabric in both directions of the weave (these directions are referred to as warp and weft) Generally, the higher the thread count, the silkier and lighter the sheets