Folds By 50% - Easily fold and store comfortably in any bag or backpack. FEND a helmet that is always with you. Whether you're riding bicycles, scooters, skateboards, or e-vehicles, FEND ensures your safety, surpassing both US CPSC and European EN1078 standards for speeds up to 20mph. DESIGN Patented Safety Technology Designed and engineered in New York City, built with a durable ABS shell and a high-impact absorbing EPS core, featuring a durable matte finish. FIT Comfortable, Lightweight, & Adjustable No matter your head size or shape, we have you covered. Using our integrated dial fit system, adjustable straps, and extra pads, we’ve created the perfect fit just for you. Easily fold and store comfortably in any bag or backpack. FEND is a helmet that is ALWAYS with you — finally, a helmet designed for your lifestyle. Fit Guide Find a Measuring Tool: Use a string, shoelace, or USB cable to wrap around your head just above eyebrows. Mark & Measure: Mark where string overlaps and measure against a ruler or yardstick. Choose Your Size: Small: 21½ - 22in (or) 54 - 56cm, Medium/Large: 22 - 24in (or) 56 - 61cm. If you’re in-between sizes, we recommend sizing up. Commitment to the Earth We are proud members of 1% for the Planet and have pledged to donate 1% of our annual sales to non-profit organizations supporting environmental solutions. We are committed to reducing and offsetting our annual carbon emissions. Is the FEND Helmet Safe? Yes! FEND exceeds US CPSC and EU EN1078 safety standards for bicycles, skateboards, and e-bikes/scooters under 20mph. How Do I Know My Size? The FEND One helmet is offered in two sizes. The Small size measures 54-56 cm, and the Medium/Large size measures 56-61 cm. If you are on the cusp, we recommend sizing up. Please refer to our fit guide above on how to select your size. How Does the Helmet Stay Secure on the Head? Once fully opened, the helmet clicks into place and is designed with our patented safety locking mechanism to ensure the helmet will not close on impact. The adjustable straps and the rear dial fit adjuster allow for a custom fit. What's in the box? The FEND One folding helmet comes with an extra set of thicker foam pads, and a user manual.