Cortex is a piece which combines both the aesthetics of a vest and a harness. It is made of a very thick and strong leather, resembling the appearance of a body armour. 
 
Size Chart:
 
S - 38 - 40 inch chest size
M - 40 - 42 inch chest size
L - 42 - 44 inch chest size
XL - 44 - 46 inch chest size