while the interior has soft cotton/poly/acrylic blend providing some extra warmth

These are unsanforized

and this is a fabric that deserves the spotlight

the shirt features chest pockets with button flap closures and double needle topstitching throughout

Superior softness and comfort abound

Iron Heart IHSH-445-IND 10oz Dobby Cloth Short Sleeve Mechanic Shirt. - Indigo bags while the interior has softCombining a lighter weight heritage fabric with the brand's vintage styled mechanic shirt, the IHSH 445 IND is a sturdy spring shirting option. This shirt is cut from an indigo black dobby cloth, a highly textured fabric from the mid 19th century. Dobby cloth is achieved by manipulating a fabric's yarns with a loom attached device called a dobby that allows for textural, dimensional weaves. Unlike Iron Heart's all indigo dobby cloths, this fabric is