What characteristic is true about a dry suit zipper?

The characteristic that is true about a dry suit zipper is that it is similar to zippers used in space suits. This similarity arises from the need for both types of zippers to create a watertight or airtight seal to protect the user from external elements. Dry suit zippers are designed to withstand pressure and maintain a barrier against water, just like those used in space suits, which must keep out the vacuum of space and other environmental factors.

The functionality of a dry suit zipper is critical for maintaining the integrity of the suit. It ensures that the diver remains dry by preventing water from entering the suit while also providing a secure closure that can withstand the stresses associated with diving. This importance of being watertight links dry suit zippers to the technology used in space suits, where moisture and pressure management are equally vital.