100% Cotton balaclava; light, strong, durable, machine washable; the thin material is comfortable and breathable.
Stylistically it is of the classic SWAT school of design with the single hole over the eyes.Blocking the mouth makes for a sleeker and more milspec / law enforcement look. The neck and eye holes do have elasticated rims for a snug and secure fit.
Covering the mouth does deflect your breath upwards which can cause fogging on your eye protection though which is why this kind of hood is best combined with a well sealed pair of goggles rather then safety specs.