For 400 meters, and your being a strong swimmer, the time gain compared to the time loss in transition is not worth it.
Sure you can't brave the murky depths for the what, 7-8 minutes you will swim? I can't decide for you.
Make sure you pull it up well enough - ALL the way into your crotch and then ALL the way into your armpits to avoid restricting shoulder movement which tires you.
There are guides online from the manufacturers on how to don a wetsuit correctly.



Reply With Quote