Hugo Boss HB 1513771 Mens Aero Watch. A masculine chronograph to take you into the skies and beyond. The Aero is impeccably crafted from stainless steel with a 44mm case, black sunray dial, and black Ion-Plated bracelet with push button deployment clasp. The pilot-inspired functionalities of this watch include a slide-rule bezel and two matching logarithmic scales – one stationary, the other rotating – to make a host of multiplication, division and conversion calculations possible. A retrograde chronograph movement including a date display defines the bold design.