Enhance your helmet fit and comfort with S1 Helmet Lifer Sizing Liners. Designed for use with S1 Lifer and Retro Lifer helmets, these liners provide customizable padding to ensure a snug and secure fit for every rider. Specifications Brand: S1 Helmets Product: Lifer Sizing Liners Compatibility: S1 Lifer and S1 Retro Lifer helmets Material: High-quality EPS foam Purpose: Adjust helmet sizing for improved fit Design: Comfortable, secure, and lightweight Installation: Easy to insert and remove Use: Skateboarding, biking, e-bike riding, action sports Why You’ll Love ItYou’ll love the S1 Lifer Sizing Liners for their ability to fine-tune your helmet fit, increase comfort, and maintain safety.