I think these are the fire retardent version of the marpat desert pattern trousers.
Features similar to that of the others listed.
All with EGA throughout the pattern and guaranteed original
Medium Regular X 1
Waist 31-35 inch, Inseam 29 1/2 – 31 1/2 inch
Large Long X 1
Waist 35-39 inch, Inseam 32 -35 inch