Stay comfortable and warm while you work, relax or exercise. A ladies fit Heat Holders 0.45 Tog Short Sleeve Vest uses a similar thermal construction to their famous thermal socks to produce a soft, smooth weave cotton blend short sleeve shirt that is brushed inside, tested and rated at 0.45 TOG, able to hold more warm air close to the skin, keeping you warmer for longer. The Heat Holders 0.45 Tog Short Sleeve Vest has a seamless, longer length body, so it stays comfortable all day, and can be tucked in easily, with less risk of riding up and causing sudden cold draughts.