"Duckpower" Premium T-shirt

What is the ratio of duckpower to horsepower? How about horsepower to whalepower? It turns out there really is math for this stuff! What began in my head as a wordplay on Porsche nomenclature, is now a shirt that looks serious, but is bound to bring smiles from those in the know. Printed on our highest quality SUPER-soft sueded heather gray tee. 4.2-oz. 30 singles for extreme softness. Satin Label. Size Chart: XS S M L XL 2XL 3XL HPS length 27 28 29 30 31 32 33 Bust 1" below armhole 17 1/2 19 20 1/2 22 24 26 28