The WRSI Rescue Pro is the only helmet in the world designed specifically for surface water rescues and the turbulent water environment. The helmet features a multi-layer system that absorbs around 4 times the impact of other leading water rescue helmets. The helmet features an interconnected retention system that does not allow the helmet to move around on the head under hydraulic forces. The helmet features a brim for sun protection and for creation of an air pocket in some near-surface entrapments. Circumference: 19"-21.5" (s/m). Limited quantity.