Install with confidence, every time. ClickTight Installation is secure and struggle-free, whether using the vehicle seat belt or lower connectors. The ClickTight indicator helps provide a visual guide while installing the base*. Level indicators and spring-assist recline make it quick and easy to find the correct angle. Aspen base is compatible with Willow, Willow S, Willow SC, and Cypress infant car seats. *Indicator window may vary by model. Refer to user guide for specific instructions.