Named after a prototype plane powered by the sun, the Speedmaster HB-SIA is inextricably linked to the Solar Impulse project, for which Omega provided much of the technology. The watch is ideal for those with an adventurous side, with its 24-hour GMT function allowing wearers to keep track of two time zones at once. Additional features include a small seconds sub-dial, a chronograph for measuring short amounts of time, and a tachymeter, allowing users to measure speed. Each timepiece is also individually numbered and has a large 44mm case size. With its expert engineering and links to the Solar Impulse project, the HB-SIA is a reliable watch with no shortage of features.