Technically they are IPX6 rated which means "resistant to high pressure jets"...
http://news.outdoortechnology.com/20...s-it-all-mean/
Not that I generally believe these types of manufacturer ratings but my guess is that the nice click switches may not like extended immersion underwater.
I like all the features of this light, but it is a lower priced import light and not a Made In The USA X300 from a perceived durability standpoint. Note that SF doesn't actually advertise an IPX rating for the X300 series. I have had nothing but great luck with Olight products but you will have to decide how important swimming is on your list of weaponlight needs.
That said my duty and serious guns wear X300U-Bs.
Dennis.
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