This Bear Suit Top is a great way to keep you warm whether worn alone or under layers. The interior is fleece lined and it zippers up keeping you insulated. Constructed of warm, comfortable, and durable polyester Front closes with a durable nylon zipper Fleece-lined interior, two hand warmer pockets, and two chest pockets Nylon-reinforced shoulders and breathable underarms Genuine US Military Issued NSN: 8415-01-228-1356 Made in USA Please be aware that these jackets run small. For this reason, we recommend sizing up from your usual jacket size, by 2 sizes.This two-toned jacket/shirt is part of the US Military cold weather clothing layering system. Initially, there was a brown bib issued to soldiers with this top as well earning it the nickname – “The Bear Suit”.