Balaclava FR 12.1cal/cm2 The Clydesdale FR Balaclava is available as one-size-fits-all and provides complete 360 degree head and neck arc flash protection when worn with suitable face protection. The fabric is an interlock knit meaning enhanced comfort as its elastic properties mean it easily accommodates the shape of the wearer. The fabric is also very breathable being constructed of 88% cotton and 12% high-tenacity nylon. Most importantly, the fabric has a guarantee of flame retardance for the life of the garment.