Fluid dynamics. P39 is the new 8 pocket Acronym trouser. With DFMA pattern making for mobility, and Deep Pockets for storage, it achieves an easy balance of comfort, utility, and casual elegance. The unification of some of the best elements from diverse sources: workwear pockets, martial arts gusset, mil-spec fabrics, and internal finishings from classical menswear. One of our best summer pants to date.