SNOW JACKETS

WHAT ARE THE RATINGS ON SNOW CLOTHING?

All snow clothing material is rated, making it easy to determine which products are more waterproof and breathable than others. The first figure (in millimetres) is the waterproof rating, and the second is the breathability (in grams). Waterproofing and breathability are key factors in keeping you dry without the issue of overheating. Technically, the material has tiny holes that are too small to allow water molecules past but large enough to let water vapour (sweat) through. The rating system has been created to help you choose what waterproofing and breathability you need depending on the intended use and personal ability.

WATERPROOFING

Waterproofing is measured by determining how much water a fabric can withstand in millimetres before it penetrates. Material can be waterproof with a rating of 1,000mm. Most snow jacket outerwear for snow conditions starts at 10,000mm and can go up to 30,000mm.

BREATHABILITY

Breathability is measured by determining the fabric’s ability to allow moisture vapour to escape through a square metre over 24 hours. Breathable materials start at a rating of 1,000 gms and can go as high as 40,000 gms. Anywhere between 10,000 and 20,000 gms is desirable for most skiers and snowboarders. Many jackets have ventilation options, so you can still easily cool down by these vents or unzip your jacket.

SKI JACKET VS DOWN JACKET

Do I need a ski jacket when going to the snow? Can’t I use my puffer/down jacket?  Put simply, No! Although they share common materials, the structure of waterproofing and breathability is different. The purpose of a puffer or down jacket is to keep you warm by retaining body heat. When you are active (skiing or snowboarding), your jacket’s insulation keeps you warm, and the breathability component stops you from overheating, which can cause hypothermia. Generally, ski jackets have a more protective outer layer that can withstand more icy, wet, and snowy conditions.