Buyers should prioritize fabric weight, typically measured in ounces (oz). For summer jean shorts, a weight of 9oz to 11oz is ideal for breathability, while anything above 12oz is considered heavy-duty denim. Ensure the material composition meets your needs: 100% cotton offers classic durability, while a blend with 2% to 5% Spandex (Elastane) provides necessary stretch for slim-fit styles. Additionally, verify the wash type (e.g., stone wash, acid wash, or enzyme wash) as this affects both the hand-feel and the chemical residual levels.