Silence the Elements. Control the Mission. The ElementFlex Hardshell is designed for high?output movement in unpredictable conditions—delivering full weather protection without the noise, stiffness, or heat buildup of traditional hard shells. Engineered with stretch, active cooling, and a low?profile fit, it moves naturally with you while staying out of the way when precision matters. 37.5® Technology In any condition, 37.5® fabrics are working with your natural microclimate to keep you performing at your peak, longer. By capturing your natural infrared (IR) energy, 37.5® can evaporate moisture to keep you cool or reflect it back to you to keep you warm so, you can stay comfortable no matter the weather or activity.