The O'neill Epic 5/4 is our go-to winter wetsuit for performance and value. This chest-zip version offers extra comfort from its' watertight entry system. 
 
Here's what O'neill have to say: 

The Epic has many of the same features as our high-end wetsuits, including 100% UltraFlex neoprene, double seal neck close, LSD (lumbar seamless design) and re-engineered cover blackout zip. Clean graphics and sharp style lines makes the epic the best value in the industry.