95% Polyester, 5% Spandex Imported Pull On closure Hand Wash Only Preserve Heat Effectively: With the help of ultra-soft fleece lining, the thermal set can insulate the cold air and preserve the heat effectively in extremely cold winters. Also, the long john is made up of 95% polyester and 5% spandex which is lightweight but warm and gives you a sense of security throughout the winter. 4-Way Stretch for Any Movement: The elastic material has a 4-way stretch and it can make you do sports without restriction. Also, the long john design fits your body well and it will not bring an uncomfortable dressing experience for you. You'll feel a sense of freedom in all your activities, like shopping, running, or walking. Moisture Wicking: Many people may meet this situation: when you do some sports in winter, your underwear will be soaked with sweat and you will feel uncomfortable. However, this issue will be solved due to the breathable material. The thermal set can wick away sweat to keep you dry. More Occasions: The long johns are perfect for indoor and outdoor activities. For example, the thermal set can be used in the base layer for hiking or skiing. PLEASE REFER TO THE SIZE CHART AND CHECK OUT THE ACTUAL MEASUREMENT YOU NEED. After Service: Different people have different demands, to meet all the demands of the customer, we provide good after-service. If you have any problem with product. Please contact us in time, we will try our best to help you solve this problem.