Description Thinsulate is a top-of-the-range synthetic insulation fibre from market leader 3M that is perfect when you need clothing that is warm, light and thin. Browning clothes made with Thinsulate fibres insulate wearers against the cold, are extremely lightweight and can be easily stuffed into a bag for trouble-free storage. Features Water Repellent Breathable Light Thermal Insulation Browning Clothing Sizing Chart: