Calculated Track Jacket

Calculated Track Jacket Very breathable (has white mesh lining along inside) Zipper fully functional I noted this as a small because that is what it seems but there is no tag, please refer to measurements. Measurements: Pit to pit: 21.5" Length (neck to bottom): 20.5" Sleeve Length (shoulder stitch to end): 20.5" ***Small stains along sleeve, see photos for reference***