PIP Boss Therm Heated Baselayer Vest includes two-way locking Velcro straps, easy to adjust for a secure, unrestricted fit for any body type. Utilizing innovative flexible heating panels built into the chest and back, with three available heat settings that provide long lasting, reliable warmth at the press of a button. This active fit ones size fits all vest is designed to warm and maintain core body temperature, the breathable soft-shell material provides lightweight comfort, and versatility. With two intuitive modes, easy to operate with a press of a button, control the temperature settings with the heating control located on the vest or, separately with the convenient remote control that is included allowing the wearer to continue working without removing clothing layers to adjust the temperature settings. With three separate settings easily select your preferred temperature range, With three separate settings easily select your preferred temperature range, LOW HEAT - 90° F, MEDIUM HEAT - 115° F, HIGH HEAT - 135° F.