When sourcing ski wear, the most critical technical metrics are Waterproof Ratings and Breathability Ratings. For professional use, look for a minimum of 10,000mm waterproofness and 10,000g/m²/24h breathability. Ensure the garments feature taped seams (fully taped is preferred over critically taped) to prevent water leakage through stitch holes. Additionally, verify the use of Durable Water Repellent (DWR) coatings and high-quality insulation materials like PrimaLoft or 3M Thinsulate for optimal warmth-to-weight ratios.