Polar has launched the Grit X Pro outdoor smartwatch, and although it doesn't seem to have changed much over the current model, it does also come in titanium.
Heart Rate Monitors
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Polar Grit X Pro - GPS Multisport Smartwatch - Military Durability, Sapphire Glass, Wrist-based Heart Rate, Long Battery Life, Navigation - Ideal for Outdoor Sports, Trail Running, Hiking : Electronics
RUGGED DURABILITY: Scratch-resistant sapphire glass and FKM wristbands make this watch even stronger than its predecessor. With MIL-STD-810G premium
Polar Grit X Pro - GPS Multisport Smartwatch - Military Durability, Sapphire Glass, Wrist-based Heart Rate, Long Battery Life, Navigation - Ideal for