DA PAM 670-1: 4-4. Materials
Quick Answer
The ACU fabric is 50% nylon and 50% cotton. The flame-resistant combat uniform is 65% flame-resistant rayon, 25% para-aramid, and 10% nylon. The IHWCU fabric is 57% nylon and 43% cotton, and is no melt, no drop.
Important
Unit and command policies may be more restrictive than AR 670-1. Always verify with your chain of command for local policies.
Official Source
View DA PAM 670-1, Section 4-4 (Page 21)Full Details
4-4. Materials
a. The fabric of the ACU is 50-percent nylon and 50-percent cotton.
b. The fabric of the flame-resistant combat uniform is 65-percent flame-resistant rayon, 25-percent para-aramid, and 10-percent nylon.
c. The fabric of the IHWCU is 57-percent nylon and 43-percent cotton. Material is no melt, no drop.
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Disclaimer: This information is provided for educational purposes only. AR670.com is not an official U.S. Army resource. Always verify guidance with official publications and your chain of command.