Burtle inner vest with thermocraft. - Color: Black - Design: Zip-up vest - Features: Lightweight material - Brand: Burtle - Accessories: With cable Size: M Model number: 3214 Thermocraft is TC250. Includes a conversion connector, allowing use with AC300 and later batteries. Without the conversion connector, it can also be used with earlier batteries. Please check the product condition in the images. This is not new, so please refrain from purchasing if you are sensitive to used workwear or do not understand its nature. Thank you for viewing.