Warm, flexible, comfortable and quick draining, Powerstretch is an excellent material for caving, as those who own an Illamina undersuit know well. In the cave environment where wind-chill is much less of an issue than in the mountains, it is possibly the best for warm head wear.
Our balaclavas are made by Meander to a very high standard. Ours is a single hole version, available in black. A must for winter cavers, and always a potentially vital piece of safety kit.