Waterproof Ratings Explained

The waterproofing levels of ski wear are definded by industry-standard methods for assessing water resistance. This measurement is typically expressed in millimeters (mm) of a water column and corresponds to the material's ability to resist water pressure without leaking. Here’s how it is done:

Testing Method: Hydrostatic Head

The waterproofing of ski wear is determined through a hydrostatic head test:

• A sample of the fabric is stretched over a testing apparatus.
• A column of water is applied to the fabric in millimeters.
• The measurement indicates how tall the column of water can be before the fabric starts leaking.
  • For example, a rating of 10,000 mm means the fabric can withstand a 10-meter-high column of water.

Kids Ski Wear Waterproof Levels

• Waterproof (5,000–10,000 mm): Suitable for light to moderate rain or snow.
• Highly Waterproof (10,000–15,000 mm or higher): Ideal for heavy rain, wet snow, or skiing in wet conditions.
• Fully Waterproof with Sealed Seams: Some garments also include taped seams and waterproof zippers, ensuring no water seeps through the stitching or openings.

Additional Factors to consider

• Durability of Coating or Laminate: Testing ensures that waterproof coatings or membranes (like Gore-Tex or Reimatec) remain functional after wear and tear.
• Breathability: Balances waterproofing with the ability to let moisture (sweat) escape, keeping the wearer dry and comfortable.
• Fabric Layers: Multi-layer constructions enhance both waterproofing and durability.