I can go anywhere in the winter if I wear this. I can easily wear just a T-shirt or a shirt underneath. I haven't had many opportunities to wear it. I'm selling it to organize my closet. It's a replica, but the performance is the same and it's in good condition. Please feel free to ask about a price reduction. The "Happy Suit" refers to the insulated set-up defined as the highest level 7 in the US military's Extended Cold Weather Clothing System, ECWCS, designed for layering. It mainly refers to the jacket, and the name comes from the smiley face mark on the tag of the initial model. The US military's cold weather clothing system, introduced in the 1980s, became the 3rd generation in the 2000s, combining 7 levels (types) of clothing from LEVEL 1 to LEVEL 7. The GEN 3 LEVEL 7 jacket is also called "Marshmallow Suit" in the Army and "Happy Suit" in the Marine Corps. LEVEL 7 is the final layer of ECWCS and can withstand environments down to minus 46 degrees Celsius depending on the inner layers. It is not worn during combat, but is intended for use during standby at forward bases, and has only two pockets that also serve as hand warmers. I bought it new, but it is a used item, so please understand. USNAVY Military Military items Military items Military MA-1 Nylon jacket Parka Mountain parka Down jacket Columbia Patagonia Patagonia North Face North face Nuptse Baltro Gore-Tex Level7 Level 7 ARMY ECWCS