Which part of the dry suit is essential for sealing out water?

The seals of a dry suit are critical components designed to prevent water from entering the suit. They are typically located at the neck and wrists and are made of materials like latex or neoprene. These seals create a snug fit against the skin, effectively blocking any water from leaking in, which is vital for maintaining thermal insulation and comfort while diving.

In contrast, other components of the dry suit, such as valves, are responsible for regulating air pressure and allowing for venting but do not provide waterproofing. Zippers, while important for donning and doffing the suit, also do not seal the suit against water. Pockets are practical for carrying gear or accessories but do not contribute at all to keeping water out. Therefore, the seals are fundamental to the suit's primary function of keeping the diver dry and comfortable underwater.