Freediving Wetsuits are very different from scuba diving wetsuits or surf suits

Freediving Wetsuits are very different from scuba diving wetsuits or surf suits. Scuba suits normally are one piece with a zipper up the back with no attached hood. Freediving suits are typically two pieces with an attached hood and there are no zippers.
The two pieces consist of a high-waisted pant, also called a farmer john, and a top that slides over your head, which has a beaver tail on the bottom to hold the top up. The attached hood keeps you streamlined and warmer. You typically get more cold during freediving than scuba diving because you try to lower your heart rate down so that you are more efficient with your oxygen consumption. Usually a lower heart rate means lower body temperature.
You need to look for a very high quality neoprene when searching for your perfect freediving suit.  likes Yamamoto neoprene that comes out of Japan. She feels that this is one of the best neoprenes out there. It is extremely flexible and extremely warm.
There are a few different kinds of freediving wetsuits. There are competitive suits and recreational suits. Each has its advantages and disadvantages.
Competitive suits are smooth on the outside with open cell neoprene on the inside. There are also recreational suits that have nylon on the outside and they offer more protection from the environment in case you are near rocks or rough terrain.
There is no nylon on a competitive suit so that means there is more flexibility so that you can take your full maximum lung volume. If Erin takes her full maximum lung volume in a t-shirt, it is approximately 6.25 Liters. If she takes her maximum lung volume in the most flexible competitive suit out on the market, she loses an entire Liter off of her volume. Now imagine what her lung volume in a recreational nylon suit would be that restricts her volume even more. Your lung volume can also change wearing a 7mm thick suit versus a 3mm. This is something you want to consider when choosing your freediving suit.
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http://www.1x-diving.com/oxygen-wetsuits/
http://www.1x-diving.com/prodotto/oxygen-freediving-wetsuits/