The Beeswift Arc Compliant Navy Blue Long Johns are soft, comfortable and warm thermal undergarments. Ideal for working outdoors in cold weather conditions. The long johns are made from anti static fabric (60% Modacrylic, 40% cotton 210gsm) with contrast FR sewing thread. This fabric is inherently flame retardant - the FR properties will not diminish with repeated laundering. Each garment is independantly tested to both box and open ARC standards.