Four season warming layer with soft brush inneran incredibly versale warming garment that will be worn all year works as an outer layer for summer evenings or slips easily underneath a waterproof jacket in the winter features mizuno warmalite hollow fiber yarn technology to recycle body heat for an efficient insulating effect machine washablemizuno warmalitethermal andor insulating yarns that keep the body warmblindstitchingfour needle flat lock seaming provides a smooth comfortable inner