This is one little warm hat. The camo pattern I chose for this hat was Realtree AP. It was a great cold weather hat to add to my pack that really held in the warmth on my head. The inside is lined with the Under Armour liner material and then a soft fleece makes up the outside of the hat. The fleece is very soft and quiet and does not have the bulk of a traditional stocking hat. The fit is quite tight and take a bit to get used to, but I am sure that also contributes to its capacity to keep you warm. On extremely cold days I pair it with the Under Armour Facemask and that gives me excellent face, neck and head coverage.