Next, it's time to measure the band width. Get a ruler or calipers and measure the space in between the lugs on your own watch. If it's a cloth band and can't endure a handful of runs with the washer, it's probably not a good idea to use that band https://allhealthmarket.com/product/aeahmarket/appleband/silicone-strap-for-apple-watch/apple-watch-silicone-strap-band-44mm-40mm-45mm-41mm-42mm-38mm-45-mm-accessories-correa-bracelet-iwatch-series-6-5-4-3-se-7/