When sourcing sports jackets, prioritize moisture-wicking fabrics (such as polyester or nylon blends) with a high GSM (Grams per Square Meter) for durability. Ensure the fabric features four-way stretch technology to allow for maximum range of motion. For outdoor use, verify the Waterproof Rating (measured in mm) and Breathability Rating (measured in g/m²/24h); a standard performance jacket should ideally offer 10,000mm/10,000g respectively. Additionally, check for reinforced stitching and YKK zippers to ensure longevity under high-intensity use.