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NEXTDurable, weatherproof outerwear got more comfortable with the incorporation of the first underarm vents that could be opened and closed. MSR used them first in its rain jackets and parkas. Breathable but waterproof jackets hit the market the same year that MSR devised the pit zip, when most waterproof jackets were made of thick plastic that trapped in moisture and sweat. Adding pit zips allowed weatherproof shells to vent from a particularly moist area that was also at low likelihood of getting wet from the outside.
MSR rain jackets were the first to use pit zips
Photo: Courtesy of MSR
