Incorporating a material originally designed for NASA, ISAORA introduces the Limited Edition PCM Insulated Shirt. PCM (Phase Change Materials) contains molecules that trap and release heat as needed by altering their aggregate condition from solid to liquid and vice versa. The overall composition has been set to a particular temperature range, so if the body temperature or the outside temperature rises, the excess warmth is stored. When the temperature drops, the previously-stored warmth is released again. With that said, the ISAORA PCM Shirt maintains the perfect temperature equilibrium at all times. Grab yours now in black or navy here.