Get ready for picnics, backyard garden parties, date nights and everything in betweenGarden accessoriesPicnicware 100M Water resistant: By using a water resistance of nearly 100M you can easily tackle most conditions in life, for instance washing palms, rain, swimming(remember to tighten the crown when heading in to the drinking water). https://www.watchesworld.com/a-history-of-watch-reference-numbers/