The water resistance levels of our THOMAS SABO Watches range from simple splash-proof watches (3 ATM) to sports watches designed for swimming (10 ATM), depending on the model. The water resistance level of each watch can be found on the case back of the watch. A water-resistant watch is designed to prevent outside elements such as water, air and dust from entering the watch movement. Please note: the higher the specified value (from 1 ATM to 30 ATM), the more resistant your watch will be against water. A watch with water resistance of up to 5 ATM can be worn in the shower or bath, but NOT for diving or swimming - this requires at least 10 ATM. The waterproofness is not a permanent condition. Regular wear of the seals or improper use can impair this function. Therefore, an annual check of waterproofness is recommended.