Lighter, grippier and made for movement, the Marathon TSAR WW194007SS-0130 puts the 41mm Tritium Search and Rescue diver on a black 3-piece rubber strap. For paddling, hiking, cycling or a summer of swimming, this configuration lets the watch disappear on your wrist until you need it.

Swapping a bracelet for rubber changes the character of a dive watch more than you might think. The weight drops, the watch sits closer to the wrist, and there is no metal to heat up in the sun or catch on gear. This strap is a Marathon 3-piece FKM rubber kit made in La Chaux-de-Fonds, a material chosen because it resists UV, salt and chemicals. The case, meanwhile, keeps everything that makes a TSAR a TSAR: brushed 316L steel, a screw-down crown with guards, a sapphire crystal and a 300-meter rating.

A Swiss ETA F06.115 HeavyDrive quartz movement keeps it accurate whether you wear it daily or only on weekends, and the tritium tubes on its markers and hands stay lit through early starts and late finishes. Grab it, go, and don't baby it.

TSAR WW194007SS-0130 on Rubber, Key Specifications

• Reference: Marathon WW194007SS-0130, 41mm TSAR
• Movement: ETA F06.115 HeavyDrive Swiss quartz (end-of-life indicator)
• Case: 316L steel, 41mm wide, approximately 14mm thick, 48mm lug-to-lug
• Water resistance: 30 ATM
• Crystal: sapphire
• Dial: black, date at 4:30, tritium markers and hands, MaraGlo seconds
• Bezel: 120-click unidirectional with MaraGlo pip
• Strap: black 3-piece FKM rubber, 20mm

For an active life, rubber and tritium are a hard combination to beat.