Tailored and innovative, this pant uses Core Temp fabric infused with 37.5® Technology and the power of active particles derived from volcanic sand to warm up or cool down, as needed. Temperature-Regulating, Wrinkle-Resistant, Stretch. NEW SLIM FIT: We updated our slim fit by taking in the leg from knee to hem for a slightly slimmer fit. SUSTAINABILITY: Made with recycled polyester. Zip fly with button closure. Belt loops.