Founded by the legendary Dr. Ron Hill, textile chemist, and triple Olympian, who understands how running socks should perform. Hilly socks come in two thicknesses - Mono Skin (single layer) and Twin Skin (double layer). At RapideRunning we stock a comprehensive range of men’s and women’s Hillies so you’ll definitely find a pair that works for you! All of their socks have a seamless fit to reduce blistering. and ventilation panels to keep your feet cool and dry. Not just for runners, Hilly socks are multi-purpose and offer great features for other sports like cycling, racquet sports, hiking, etc.