Arc Long Johns made of Lenzing FR and merino wool. A dual-layer underwear that reduces the risk of 2nd and 3rd degree burn injuries considerably. Good protection, excellent design and lightweight fabric making this the most advanced flame retardant underwear on the market. Lenzing FR reduces the risk of heat stress and has very limited shrinkage caused by heat. The knitting structure in combination with merino wool results in garments that absorbs and transports moisture from your body to the outer layer where it evaporates. The inner layer of Lenzing FR gives a feeling of silk to your skin, perfect for sensitivity to wool. The outer layer from 100 % fine, merino wool insulate against coldness and keeps you warm even when it is wet. This base layer is ideal for high activity jobs where you are working in cooler weather conditions, but the work will cause you to sweat.