The neoprene on this O'Neill wetsuit is just incredible. This is by far their best technobutter, and I have had the chance to try a few of them. It slips on very easily, whilst your mates are fighting with their wetsuit, doing all sorts of moves to fit it, you're already in the water. It was my first zipless wetsuit, I am amazed by the simplicity. It is also flexible, and stretchy it doesn't feel like a 4/3mm. And I am not the only who feels that way. All the people around who have tried it were impressed. And most importantly, it's warm. Now that I own this, I feel like my 5/4mm isn't needed anymore. you can buy this wetsuit your eyes closed you won't regret it.