Motorcycle Thermal Wear Thermal clothing from the Louis range gives the ultimate protection for bikers when the thermometer drops to zero and below. Whether a one-piece thermal overall or a jacket and trouser set, the principle is the same: the thermal lining creates an insulating layer of air under the wind- and waterproof outer shell. The design is so effective, this thermal clothing is not to be recommended once the temperature reaches 10 degrees (Celsius) above zero. And best of all: Thermal clothing from Louis is comfortable to wear over any standard motorcycle gear. Tip: When you try on thermal clothing, it's best to wear your normal motorcycle gear. If you're in any doubt, you can order two different sizes from Louis online and try them out. Louis will take back any item that does not fit or which you do not like.