I don't believe the one that came with the 305 was. You can check your owners manual. If it is at all, it will be for 1 meter for no more than 30 minutes.

You will have no problem swimming with it. I have swam with mine for 3 years in races and have never had a problem.

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"Sometimes you got to learn to hurt"

I'm with peewee, I've swam with my strap for over 2 years without an issue.

X2

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"if you chose it, it's not really pain"

If you have a wetsuit on..... it will stay dry. :)

If you have a dry suit on it might stay dry. I wear mine at every race and have no issues. It it waterproof to a degree (not to any great depth so maybe scuba would be out) and the battery compartment has a decent rubber seal.

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https://www.pbandjcoaching.com
https://www.thisbigroadtrip.com

You can get a "soft" strap from Garmin that is bundled with the 310XT. I have worn both in the water for the past 3 years without a problem. The "soft" version has a lower profile and the actual unit is a fraction of the width - so it lays better on the chest.

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Straightenin' the curves; Flattenin' the hills
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Coached by Mike Plumb @ TriPower MultiSports
https://www.strava.com/athletes/1149072 - https://www.instagram.com/thoswoods/

I have swam in mine with & without a wetsuit and never had a problem.

You should be fine.

Dozens of swims in salt/pool/lake over the last 3 years on mine...zero issues.

Mine hasn't had any hiccups after racing a HIM with it underneath my wetsuit.
Sounds like everyone's in agreement on this one: it's fine to swim with in a race.
I just wouldn't wear it in the water other than races. No need to unnecessarily chance killing it.

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U of N Alabama: Triathlon & XC

Thanks everyone.
It's great being a slow twitcher.

should be fine...just try not to set a free diving records...