It doesn't take a brain surgeon to know elbows bend and forearms don't. It does, however, take the PhD Knit Arm Warmer to accommodate these movements with stay-put comfort and warmth all run long. Seamless construction for warmth with maximum freedom of movement. Non-binding 1x1 rib welt at wrist and bicep opening keeps warmers in place. Materials: 62% merino wool, 35% nylon, 3% elastane. Machine wash warm, inside out. Tumble dry low, or lay flat for best appearance. Made in U.S.A.