Arcteryx Pelion SS Polo - Men's Manmade,Nylon,Wool,Wool Blend Made in USA or Imported Merino wool with a nylon core provides durable, long-wearing comfort, odour resistance and thermal management Polo style with buttons Gusseted underarms for mobility and freedom of movement Merrow stitch seam construction reduces seam size Merino wool engineered with a Nylon core for increased strength and durability