Introducing the NEW…. Extreme Necklace Twist – Metax, one of the EXTREME PERFORMANCE GEAR Series by Phiten with METAX technology. Supports the performance of people who enjoy daily sports, to the athletes who compete in extreme conditions. The Twist Necklace is water resistant and has a stylish and impressive design. Available in black/red and red/white. 43cm/17 inches and 50cm/20 inches.