Yes, the second number on the shirt tag refers to the sleeve length. Whereas the first refers to the neck measurement.

Our shirts are certified by the US Army Natick Soldier Systems Center (Natick) which publishes the “technical” specifications for uniform items, including the ASU shirt. For us to be certified, we must conform to the measurements Natick specifies. In this case, your question is pertaining to one of the technical specifications – the length of the shirt body as measured from the seam at the back of the collar seam to the bottom hem down the center of the back. Natick conducts the field testing of the shirt to test the “performance” spec – in this case, determining if the shirt body is long enough to stay tucked in during its intended use.

Marlow White’s shirts are made to spec, to the length that Natick requires which is a length dependent only on the shirt’s neck size. We rarely have seen a problem with the length and when we have it was with a Soldier who was wearing the trousers too low (off the waist and on the hip) and/or with a very tall and thin body frame.

Sir, our shirts average about 33-1/2" in length. If you are above 73" in height, you may face issues with the shirt coming out when sitting down.