Soft and lightweight, our best-selling Core Temp fabric uses 37. 5® Technology and the power of active particles derived from volcanic sand to warm up or cool down as needed. Temperature Regulating, Quick Dry, Wrinkle-Resistant Mid-rise, straight fit. Sustainability: Made with a blend of recycled polyester. Front pockets. Rear welt pocket with button closure. Zip fly with button closure. Belt loops. Unlined.