Identifying a high-quality puffy jacket can depend on several factors. Primarily the material, filling, and craftsmanship. Look for a jacket with a higher fill power ( around 800 and above), which indicates superior warmth retention capacity. Pay attention to detail in the stitching. Double stitching or bonded seams are often a sign of good construction. Moreover, the exterior material must be durable and also water and wind resistant for utmost protection from harsh elements.