The S1 Lifer Helmet is a must-have for skatepark enthusiasts, offering EPS Fusion Foam technology, which not only provides superior crash absorption but also lightweight design, allowing you to enjoy your favorite sport with ease. These helmets are CPSC and ASTM certified, ensuring safety and performance. However, what truly sets the S1 Lifer Helmet apart is its customizable medium watermelon size (54.6 cm). With this option, you can find the perfect fit that suits your needs perfectly, providing both comfort and security while you're skateboarding, BMXing, or roller skating. Choose the S1 Lifer Helmet and experience the perfect blend of style, safety, and performance on your next adventure.