Meet the Mizuno Women's BT Layered Tight, a revolutionary winter piece whose goal is to change the world of winter runners, one drop of sweat at a time. The Breathe Thermo fabric technology uses moisture lifted from the skin to generate heat, keeping you warm in the chill of winter months. An extra layer of material is placed into front thigh panels for extra insulation, a back pocket provides storage, and ankle zippers make for an easy on/off transition.