Factory New Design ECE R129 Isize Headrest Adjustment Baby Infant Car Seat. ECE R129 iSize Certified: Complies with strict ECE R129 and iSize safety standards for infant car seats. Side Impact Protection: High quality PP material provides enhanced side impact protection for the baby. Adjustable Headrest: 10-position adjustable headrest with shoulder belt linkage for growing infants. ISOFIX Compatible: Compatible with ISOFIX base for secure installation (base sold as option). Stroller Compatibility: Compatible with various strollers using removable adaptors for easy connection. Full Customization: Offers full customization, minor customization, and customization from samples.