M43 field cap

The ski cap is a type of field cap used by several German-speaking or German-influenced armed forces from 19th century till present. The design originates from imperial Austria-Hungary, but is best known for its widespread use as M43 field cap (Einheitsmütze) used by the German Wehrmacht and SS, during World War II. A similar design of the field cap was previously used in Germany as the distinguishing headgear of the German Gebirgsjäger's ski cap, the only differences being the bill was slightly extended and the top panel of the hat had a smaller circumference, giving it slightly sloped-in sides. The design and its successors that are still in use today are the German counterparts to the American patrol cap or utility cover.

There are several variants of the ski cap, starting with the Gebirgsjäger's ski cap. This was the first in the family of caps, and was recognized by a high peak, a teardrop shaped top, a short bill, and a small skirt that folds down to protect the ears in cold. All Bergmützen had a small edelweiss or a grouping of Jäger leaves, depending on the unit. During the Second World War, the ski cap was generally made of field grey or field blue wool, depending on whether it was used by the Heer, SS, or the Luftwaffe.

The precursor to the German Bergmütze was a service cap first issued to Austrian Imperial-Royal Mountain Troops in 1906. During World War I, this cap was made of Hechtgrau (pike grey) wool and had a turn-down brim to cover the wearer's ears in cold weather. German mountain troops, who initially wore a grey peakless forage cap resembling a sailor cap, adopted the Bergmütze in 1915 as a gesture of solidarity with their Austrian allies. Both the German and Austrian Bergmützen bore edelweiss insignia, the mark of an experienced mountain climber, but, unlike the leather peaks of the Austrian caps, the peak of the German cap was covered with slate grey wool.

...
Wikipedia