The Arctic Double Collection is the epitome of performance under garments. Internationally recognized as the best performing base layer with numerous awards and accolades. The concept is simple, combine Brynje’s performance ST Polycolon® synthetic mesh underneath the highest quality Merino wool fabric. The mesh provides 4 to 6 times the insulating power of solid knit fabrics while allowing perspiration to “transport” in vapor form to the outer layer. The Merino wool outer layer traps the air inside the mesh cells to provide warmth while absorbing and wicking moisture away from the body. No other single undergarment provides this functionality. The Arctic Collection garments are used extensively by Police, Fire Service, Special Forces and polar expeditions. They are the best choice for extended exposure to cold temperatures and high exertion.