The C4 is Vaer’s pinnacle solar-powered watch and a true operator’s tool. Accordingly, it’s incredibly tough and capable: It features a sturdy bead-blasted steel case with a 200-meter water-resistance rating, scratch-proof sapphire crystal, and bright C3 Super-LumiNova lume. Its solar cells power a Japanese quartz movement for dead-accurate timekeeping, and it has an impressive six-month power reserve when fully charged. Assembled in the USA, the C4 is a no-compromise tool watch built to handle the absolute worst the field can throw at it.