About this Item Material Composition 100% Polyester Country of origin China About this Item 2 Pieces Thermal Underwear Set: long sleeve top + full length bottom,long John Set. Single layer without fleece lining–lightweight,stretchy. Ideal for spring autumn winter Thin Long Underwear:BASE LAYERS,it won’t look bloated,no matter if you are exercising or working,there is no obstacle,and keep warm cozy in freezing cold climates or bad weather. Moisture Wicking Thermal Underwear:Unique fabric,breathable,keeps warm while keeping it dry.Make winter outdoor sports more comfortable. Fitted Pajama Set:Comfortable fabric while keeping warm,it’s a nice pajamas set. SIZE— Please ref our size chart in picture before ordering, which are same as size labels on the package. Please ignore the tag size.