WHY KNOCK?
What makes Knock different from other surf helmets?
Most surf helmets are adapted from other sports or built for whitewater. Knock was designed from the ground up for surfing — the way water moves, the forces it generates, and what a full season of sessions actually demands. Every feature, from the EPP foam to the internal channels, is specific to surf.
What is EPP foam and why is it better than EVA?
Most water helmets use EVA foam — it's soft, but designed for cushioning rather than impact protection. It compresses with each hit and degrades quietly over time. EPS, used in many skate and bike helmets, handles a single hard impact well but crushes permanently after one serious wipeout.
Knock uses EPP: Expanded Polypropylene. It disperses impact energy efficiently and is designed to spring back into place after each hit. It doesn’t absorb water and doesn’t degrade with repeated use. In surfing, you’re not taking one impact. EPP was built for that reality.
How does the flow-through system work?
Most helmets fight water. Knock works with it. The shell features strategically placed vents sized and positioned to maintain structural integrity while allowing water to pass through freely. Inside, moulded EPP channels direct that water along precise pathways — out of the helmet and away from your face and eyes. The result is less drag, less neck strain, and fewer of the sudden deceleration forces that build up when water has nowhere to go.
Is Knock certified? What testing has it undergone?
Our V1 Knock helmets, which feature an open-ear design, have received a four-star rating from the Virginia Tech Helmet Lab. We are currently working on a V2 helmet, with a closed-ear design, which we hope will get a five-star rating.
The V1 Knock helmet is also EN 1385 and CE marked. EN 1385 is the European standard developed specifically for helmets used in water sports—covering impact absorption, retention system strength, and field of vision. CE marking confirms the helmet meets European safety requirements and has been independently verified.
Can I use Knock for other watersports?
Yes. Knock is EN 1385 certified, which covers a range of whitewater and paddle sports including kayaking, canoeing, and rafting. If it moves fast and hits hard, Knock was built for it.
ORDERING
How do I find my size?
First, wrap a string around your head one finger width above your eyebrows and right above your ears—this is the widest point of your skull. Now measure the string to determine your helmet size.
51–55 cm. Small
55–58 cm. Medium
58–61 cm. Large
If you're between sizes, size up. A helmet that's slightly large can be tightened down through the fit system. One that's too small can't be sized up.
What is your returns policy?
If your Knock helmet hasn't been used, we'll accept a return within 30 days of delivery for a full refund—including free return shipping within the continental US.
Need a different size? We'll cover the exchange shipping too, as long as the helmet is unused and in original condition. Pre-orders can be cancelled any time before your helmet ships. Just get in touch.
How much does shipping cost?
Shipping is calculated at checkout based on your exact shipping address.
What is your warranty?
Knock helmets are covered by a 2-year warranty against manufacturing defects from the date of delivery. If your helmet takes a significant impact within 3 years of purchase, contact us and we will replace it at 50% off. If something's wrong with the product, get in touch and we'll make it right.
When will my pre-order ship?
Pre-orders are shipping the first week of January, 2027.
You'll receive a confirmation email when your order is placed and a shipping notification when it's on its way.
