I use a ripcurl 4/3 F-Bomb chest entry wetsuit in 50 Degree water in early Spring & Late Fall in New England - works like a champ, I get ZERO water penetration into the suit - even if I take a major digger. the 4/3 wetsuit gives we a wider range of coverage in terms of usable temps, but its clearly not as warm as a dry suit - especially after your run is over waiting in the boat for the next run. It was as expensive as a dry suit, but has been worth every penny.