The MST513 in dark grey works the same construction logic as the black version but reads differently against the skin. Grey cotton jersey absorbs less heat than black and reflects ambient light back as a low-contrast surface -- the structured insert panels read as tonal variation rather than sharp contrast, giving the garment a quieter, more integrated look. The 94% cotton shell is dense enough to hold the relaxed drop without bunching; the 6% elastane recovers the fabric after movement. Raw cut side slits at the hem are left unsealed -- the fabric edge will soften slightly over wash cycles without fraying structurally. Elastic waistband with extended drawstrings. Hidden internal safety pocket. The grey colorway earns its place not by being neutral but by being precise about what kind of grey it is.