Sidi Dynamic aerosols The upper part of the sock is made of aerodynamic smooth Lycra material The leg of the sock has silicone dots to prevent the sock from slipping down Q-skin yarn – silver fibers in the sole material prevent bacteria growth and unpleasant odors A compression strip in the middle of the sole gives the foot a feeling of lightness Material: Foot section: 55% polyamide, 10% polypropylene, 35% elastane; leg section: 80% polyamide, 20% elastane Sizes: S/M (35-39) L/XL (40-43) XXL (44-46)