Fishing pants

Fishing pants are a piece of equipment designed for prolonged immersion in water, enduring dynamic water pressure and body stretching. Their waterproofing core often lies in that unassuming airtight zipper at the chest or pocket. The fabric of these water pants is virtually impervious to water leakage; the only point of breach is an opening. How does an airtight zipper allow you to work for hours in waist-deep or even chest-deep water while remaining completely dry? The answer lies entirely in its sealing mechanism.