Harley Davidson Men's Essential Colour Blocked Mechanics Shirt Cotton Twill Seat Hardware Required to install Adjustable Rider Required to install Adjustable Rider Backrest on '09 later Touring models (except '21 later FLH The surrounding Harley Davidson Motorcycles script adds the perfect finishing touch to this striking design The mechanic silhouette what it means and why it suits this shirt: The mechanic shirt silhouette is a workwear derived cut that's slightly shorter in the body and roomier through the chest and shoulders than a standard casual shirt designed for freedom of movement when working over a bike or engine rather than for a tailored The shorter length means it doesn't bunch under a jacket or riding gear