Meet our infamous APeX socks' feisty little brother!! The AiRFLeX is a top of the line, high tech, premium no-show sock. The AiRFLeX brings two ideas together - ventilation and fitness. We specifically added the Air-Flow Ventilating Top (Marked in Blue on top of the sock) to allow and demonstrate the power of the airflow within the sock. We still have ventilation marked with the Orange line all on the side, as well as a band of protection layered in solid Blue. Extra high-end material costs make this sock more durable and have higher-quality, but is 100 % worth the price. Ideal for Fitness freaks, crossfit, yoga junkies, working out, or anyone who likes high-quality socks! These no-shows will NEVER slip back into your shoe. Comparable product to under armour Speedform, retailing at $12.99. Unisex Adult, One Size Fits All.