Helps with the cold but neck is very annoying
"Have worn this twice under a wetsuit now to protect from the cold; it definitely helps although under a wetsuit it does feel a bit more restrictive around the arms. Swam 2. 5k event front crawl which was doable, just wasn’t very comfortable at the beginning but loosened up. What was annoying was the neck - the next is VERY high and when swimming it digs into my neck. Impossible to do anything about this as the zip goes all the way up, so the solution is to leave a bit of the neck unzipped. I am a 10 in clothes and bought a 10 and it’s a good fit. Hard to get on and off on your own, maybe there’s a knack I haven’t worked out yet! Simple to order, be sure of your size before using."