Pearl iZUMi Women's W Elite Thermal Arm Warmer 100% Other Fibers Imported Spring/summer 2017 Women's specific fit. ELITE thermal fleece panels provides superior warmth, stretch, and Recovery. Anatomic left and right arm-specific fit Plush wide elastic binding with silicone gripper for a stay-up fit. BioViz reflective elements for low-light visibility Fabric: 56% Nylon/30% Polyester/14% Elastane