Sentinel(TM) Series Thermal Base Layer Toque HoodThis thermal base layer toque offers a next-to-skin fit designed to be worn under a helmet. Provides excellent thermal protection under water rescue helmets without adding extra bulk. Made of water repellant Polartec(R) Wind Pro(R) with low-profile flat lock seam construction.Size: UniversalWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.