Are 20K Snow Jackets Really Waterproof? 5 Myths Busted
By Volcom® | Skate, Surf & Swimwear, Snowboarding Clothes ... | Published: 2026-10-16
Category: Product Reviews
We bust five common myths about 20K snow jacket waterproofing, from what the rating actually measures to why 3L construction and breathability matter just as much.
Quick answer
A 20K rating means the fabric resists water pressure up to 20,000mm before it leaks, which is genuinely waterproof for skiing and snowboarding. But the rating is only the shell's lab number: taped seams, a PFAS-free DWR finish, and breathability decide whether you stay dry on a real storm day. A 20K jacket without those details can still soak through.
Myth 1: The 20K number is a marketing label
It is a real measurement, just a narrow one. The 20K figure describes how much water pressure a fabric can hold before moisture pushes through, so 20,000mm is a specific threshold, not a vibe. It does not tell you how the jacket is built, how it breathes, or how long the finish lasts. Two jackets can both say 20K and behave very differently on the hill.
Myth 2: 20K waterproofing means you'll never get wet
Water usually gets in through openings, not through the fabric. That is why the details around the shell matter: fully taped seams, an adjustable powder skirt, and a pocket-access hem cinch all close the gaps where snow and wind sneak in. The Women's Stone Smokeshow 20K Jacket pairs its 20K waterproofing with V-Science 2-Layer tech and fully taped seams, which is the combination that keeps a storm day dry rather than the number alone.
Myth 3: Breathability is a bonus, not a requirement
A jacket that blocks water but traps sweat leaves you damp from the inside, which feels like a leak. Breathability ratings are listed alongside waterproofing for that reason, and the two work as a pair. The Men's Arthur 3L 20K Jacket uses V-Science 3-Layer recycled ripstop with a 20K/20K rating, so the waterproof and breathable numbers match. Its extra baggy fit also leaves room to layer without compressing insulation.
Myth 4: 3L and 2L are just internal jargon
The layer count describes how the shell is assembled. A 2-layer jacket bonds the waterproof membrane to an outer face fabric and adds a separate lining, which is why the Stone Smokeshow includes a breathable lining. A 3-layer jacket bonds the membrane directly between the face fabric and a backer, creating one unit. Neither is automatically better; 3L tends to feel more streamlined, while 2L often feels softer against the skin.
Myth 5: A DWR finish lasts forever
The durable water repellent finish is what makes water bead up and roll off the face fabric, and it wears down with use and washing. A PFAS-free DWR, like the one on the Arthur 3L 20K and Stone Smokeshow, needs periodic reactivation to keep performing. If the fabric starts looking soaked instead of beading, the DWR, not the 20K membrane, is the part that needs attention.
Verdicts on the biggest 20K waterproofing myths
- Myth: 20K is just a marketing number: It is a real water-pressure measurement, but it only covers the fabric, not seams, fit, or finish. Verdict: False. The number is real, but it is not the whole story.
- Myth: A 20K jacket can't get wet: Water enters through untaped seams, open hems, and gaps at the wrists and neck. Verdict: False. Look for fully taped seams and adjustable closures.
- Myth: Breathability doesn't matter if waterproofing is high: Trapped sweat feels like a leak, so waterproof and breathable ratings need to work together. Verdict: False. A 20K/20K pairing is the balanced target.
- Myth: 3L always beats 2L: 3L bonds the membrane into one unit; 2L uses a separate lining that often feels softer. Verdict: False. Choose based on feel and the rest of the build.
- Myth: DWR lasts the life of the jacket: The PFAS-free DWR finish wears down and needs reactivation when water stops beading. Verdict: False. Refresh the DWR, not the jacket.
Volcom jackets that put the rating in context
- Men's Arthur 3L 20K Jacket: Men's Arthur 3L 20K Jacket: V-Science 3-Layer recycled ripstop, PFAS-free DWR, 20K/20K waterproof and breathable rating, extra baggy fit with room to layer. Catalog price USD 292.00, comparison price USD 400.00. A matching 20K/20K rating and 3-layer build make this a strong pick for storm days and riders who run warm or layer heavily.
- Women's Stone Smokeshow 20K Jacket: Women's Stone Smokeshow 20K Jacket: 20K waterproofing, V-Science 2-Layer tech, fully taped seams, breathable lining, Zip Tech®, adjustable powder skirt, pass pocket, pocket-access hem cinch, recycled shell with PFAS-free DWR, relaxed fit with a shorter cut. Catalog price USD 211.70, comparison price USD 290.00. Shows that 20K waterproofing plus sealed seams and breathable lining is what keeps you dry, and the shorter cut suits riders who want less bulk.
- Women's Stonewind Jacket: Women's Stonewind Jacket: 1000mm coated taffeta shell with breathable mesh lining, hood, zip front, elastic waist, lower pockets, chest embroidery. Catalog price USD 43.92, comparison price USD 72.00. A 1000mm shell is water-resistant, not waterproof, so this is a windbreaker for unpredictable days rather than a storm-day snow shell.
