CARHARTT. A18BLM. MENS ACRYLIC WATCH CAP. BRITE LIME. Born in 1987 the A18 Watch Hat quickly rose as an icon. Originally designed as a workwear essential it can now be found at construction sites and campgrounds state fairs and football stadiums. Thick acrylic yarn makes this men s hat a warm option for the colder months. Soft to the touch the stretchy rib knit creates a stay-put fit.