these mens thermal tops are comfortable, warm, snug fit, stretches nicely. The size is perfect fit and it is warm and comfortable. Mens Thermal Shirt can be used as a thermal base layer during early morning runs and colder commutes. Comfy & Warm: 88% Polyester and 12% Spandex. These mens thermal long sleeve shirts made of super comfortable fleece lined fabrics, keep you warm in cold weather. Moisture Wicking: The moisture wicking and breathable fabric absorb sweat and keep you dry the whole day! High Stretch: The men workout tops for gym is designed with four way elastic fabric for free physical activity, allowing you to bend, stretch, jump and run flexibly anytime. Multipurpose: Feel free to slip into this base layer to beat the morning chill or layering up outside to withstand the cold snap . The baselayer long sleeve men is good to wear at home matching with jeans, long pants or casual pants or as a base layer under your coats, jackets, sweatshirts or tracksuits. It is a good choice to use it as a comfy pajama on winter nights too. Garment Care: Machine Washable. Durable and highly wrinkle-resistant, with performance degradation rate of less than 5% after multiple washes. This men's thermal underwear is in stardard US size, please choose your size refer to the size information under the description before ordering.