an elastic kidney closure system, this adaptable vest is compatible with Alpinestars’ BNS protectors. KEY FEATURES Protector panels are constructed from a robust polymer performance blend for optimized flexibility and excellent weight saving properties. Shells are vented and channeled to improve airflow and prevent heat build-up. Chest and back panels feature triple-layer EVA compound padding for good shock absorption and padding. Removable upper chest and back padded panels are removable to accommodate fitment of Alpinestars BNS. Removable comfort padding on shoulder straps. Elastic kidney belt and buckle system for personalized and secure fit. Silicone printed logos throughout to help secure jersey. Convenient pull tab loops on shoulders for secure fitment of Alpinestars BNS