Wetsuits provide Freedivers protection from elements such as sun, cold, stinging nettles and corals and more. They also offer added buoyancy, a helpful trait in freshwater or other areas where Freedivers might otherwise be negatively buoyant. It is important for Freedivers to find comfort in their Wetsuit- being too hot will result in loss of water (sweating) while being cold will result in decrease in breath hold times due to your bodies need to burn energy to warm up.
Thickness of the wetsuit depends on the water you will be diving and your tolerance for cold water. As South Floridians, we are spoiled with warm water, so our threshold for cold is very low. We typically wear 1.5 millimeter thick wetsuit in summer months and a 3mm in winter months and spring diving. For waters under 70 degrees Fahrenheit, we will wear a 5mm suit. Thicker suits will lead to more warmth. It also increases buoyancy and limits mobility.
A distinctive difference between Freediving wetsuits and traditional wetsuits seen in SCUBA diving and surfing is the open cell neoprene. Open cell neoprene features a more stretchy membrane compared to closed cell neoprene. Open cell neoprene minimizes water passage inside the suit, optimizing heating efficiency. The added stretchiness of open cell suits also allows for more flexibility and better mobility under water. The drawbacks of open cell neoprene are that it is slightly more expensive and less durable compared to closed cell. When using open cell suits, it is best to use a mixture of conditioner and water or some other sort of lubricant to avoid tearing.
Other things to look for in a wetsuit include quality of stitching, any previous tears or creases, hooded vs. no hood. Many Freediving suits come with a thicker chest pad, this is used for loading and unloading spearguns.