Do I need a paddle-specific PFD for kayaking or SUP?

Across the specialist paddling communities we read, the consensus is yes if you'll be on the water for hours. Paddle-specific vests have higher armholes, thinner foam panels near the shoulders, and often a high-back cut so they don't ride up against a kayak seat. A generic ski/boating vest will work for short trips but tends to chafe and ride up during repetitive paddle strokes.