【Seamless Integration】Our strap for swatch omega moon watch is intended by using a seamless integration curved in mind. 100M Watertight: Using a h2o resistance of up to 100M you can certainly deal with most circumstances in life, including washing fingers, rain, swimming(please tighten the crown when going to the water). https://www.watchesworld.com/a-history-of-watch-reference-numbers/