Heat Holders Thermal Leggings Normal & thin leggings just aren\'t enough when it comes into the colder months - but Heat Holders thermal leggings will keep you toasty warm. These Heat Holders Leggings have everything covered when it comes to keeping you nice and warm in the coldest of times. They are great on their own or under your trousers. Heat Holders - the only choice for Ultimate Thermal Performance. These super warm cosy Heat Holders Thermal Leggings keep you protected with their Advanced Insulating Yarn - this superior yarn gives these leggings high performance insulation against the cold. These leggings have a 0.52 TOG rating. What is a TOG rating? It is a recognised measure of a textile\'s thermal ability. Simply put the higher the TOG rating the better a product will be able to keep you warm. Another great feature of these leggings that ensures ultimate comfort is their Soft Brushed Inner - this maximises the amount of warm air held close to the skin keeping your legs and toes warmer for longer. They also have a Great Stretch which stretches hugs and flatters your figure - as well as a Comfort Gusset for improved fit and helps to adds comfort for all-day wear.