While it isn’t absolutely required that you wear a Suits while you are free diving or spearfishing, the water can be pretty cold, and while you’re dealing with lines under the water and potentially swimming into rocky areas, it’s best to have as much protection as possible.
Finding the perfect free diving and spearfishing wetsuit is all about determining what your exact needs. How cold is the water that you’ll be swimming in? Would you instead have more insulation and protection or more flexibility and performance?
Thicker free dive and spearfishing wetsuits will keep you warm during your colder dives, and they can also help protect you from scratching yourself on rocks or coral to a point.
On the other hand, these thicker free dive and spearfishing suits aren’t as flexible, and moving around will be slightly more difficult. Determine your needs and try the wetsuit on beforehand.