Summer on the water calls for something light, bright and fearless, and the Marathon MSAR WW194027SS-0530 is all three. This 36mm Medium Search and Rescue quartz diver pairs a crisp Arctic white Standard-Issue dial with a black 3-piece rubber strap, a combination made for swimming, paddleboarding and long days in the sun.

On rubber, the compact MSAR is about as unobtrusive as a 300-meter dive watch gets. The 36mm case is 12.5mm thick and runs on 18mm lugs, and the 3-piece FKM rubber strap, made in La Chaux-de-Fonds, keeps it feather-light compared with a bracelet. FKM resists salt, chlorine and UV, so it handles the beach, the pool and the boat without degrading, and it rinses clean in seconds.

The white dial is clear and easy to read in bright sunlight, and with no government markings it stays clean and simple. Tritium gas tubes on the markers and hands keep it legible after the sun goes down, while MaraGlo lights the bezel pip and seconds hand. A guarded screw-down crown, sapphire crystal and Swiss ETA F06.115 HeavyDrive quartz make sure it is as tough as it is easygoing.

Arctic MSAR on Rubber: WW194027SS-0530

• Marathon MSAR, 36mm Medium Diver's Quartz
• Arctic white Standard-Issue dial with 4:30 date
• ETA F06.115 HeavyDrive Swiss quartz, end-of-life indicator
• 316L stainless steel, 12.5mm thick
• Water resistant to 300m
• Sapphire crystal; guarded screw-down crown
• Tritium and MaraGlo lume
• Black 3-piece FKM rubber strap, 18mm

Small, white, waterproof to 300 meters, and made for sunny days.