Park jackets are built with one priority in mind: freedom to move. They feature a relaxed or oversized fit that won't restrict you when you're spinning, grabbing, or tweaking tricks. The looser cut also gives them that signature street-inspired style that's a big part of park culture.
Beyond fit, park jackets often include extras like light impact padding at key areas and extra insulation where you need it—like the seat—since you'll be sitting on cold features or waiting on the deck. They may trade off some technical weather protection for that mobility and style, so they're not always the best pick for storm days.
If you spend most of your time in the terrain park, halfpipe, or hitting urban features, a park-specific jacket makes sense. But if you're splitting time between the park and all-mountain cruising, an all-mountain jacket might give you better weather protection while still being mobile enough for occasional park laps.