Whether a watch can be worn while swimming depends on its water resistance rating and the condition of its seals.

It is important to understand that ATM ratings measure pressure resistance, not simply water depth. Activities such as swimming, diving, jumping into water, or rapid arm movements can generate pressures significantly higher than those experienced at a static depth.

As a general guideline:

• 20 ATM (200m) watches are suitable for swimming, snorkeling, and most recreational water activities.
• 10 ATM (100m) watches are generally suitable for swimming and surface water activities but are not intended for diving or repeated high-impact water entry.
• 5 ATM (50m) watches should be limited to everyday water exposure such as rain, hand washing, and occasional accidental splashes.
• 3 ATM (30m) watches should not be used for swimming or prolonged water exposure.

Before exposing any watch to water, always ensure that the crown is fully secured and that any pushers are not operated while the watch is wet.

Hot showers, saunas, steam rooms, and sudden temperature changes are not recommended for any watch, regardless of its water resistance rating. Heat and steam may affect seals and increase the risk of moisture entering the case over time.

Water resistance is not a permanent characteristic and may decrease as seals naturally age. Regular maintenance and periodic pressure testing are recommended to ensure continued performance.