When evaluating puffer jackets, the most critical factor is the Fill Power (FP), which measures the loft and insulating properties; a rating of 650-800 FP is considered premium for B2B retail. You must also verify the Down-to-Feather ratio, where 90/10 (90% down, 10% feathers) provides superior warmth compared to 80/20. Additionally, ensure the shell fabric utilizes Down-Proof construction (typically high-density nylon or polyester with a DWR - Durable Water Repellent coating) to prevent leakage and ensure weather resistance.