Long-sleeved thermal undershirt with ENGEL® zip collar, 92% Polyester / 8% Elastane, 205 g/m². It has a battery that, with just one click of the button, the jersey becomes extra warm and you can choose 3 heat settings. Made of fabric with antibacterial properties and a high degree of sweat absorption, which provides a high level of insulation to keep the body dry. The fabric is light which allows it to be worn under the common work uniform. Compatible with washing at 40ºC although the battery has to be removed when washing.