Evidence ReviewNegative Pressure Wound Therapy Dressing Selection: What the PVA-versus-PU Foam, Pore-Size and Closed-Incision-versus-Open-Wound Evidence Actually SupportsNavigating NPWT dressing selection requires separating material mechanics from clinical healing claims—evaluating open-pore PU black foam (400–600 µm) for high-exudate granulation against hydro-retentive PVA white foam for sensitive wound beds, respecting the 48–72 hour open-wound change boundary, and understanding the FDA regulatory divide between open-wound (OMP) and closed-incision (QFC) devices.