Our single-layer Detonator Cap(TM) is stretchy, providing a comfortable fit for the best performance. Comfort Shell(TM) is our Turtle Fur(R) proprietary performance technical fabric that is the perfect blend of moisture management, antimicrobial and lightweight element protection. It's engineered to support a demanding multi-season active lifestyle, with the softness of a brushed inside for that unique Turtle Fur(R) next-to-skin softness.