It can be cold when working outdoors and during wintery days and the cool months. Wearing our base layer tops and long john underwear will help keep you warm. Base layers, both tops and leggings, are worn underneath your normal workwear polo shirts and work trousers to provide an extra layer of protection. We have men's and women's base layers, and flame retardant underwear, so whatever your role or where you work you can stay safe and warm.