The Brooks HVAC Racer running sock is a lightweight, thermo-regulating racing sock with an anatomically correct right and left foot and a curved platform. 80% Brooks Twister II (high-tenacity textured nylon yarn)/15% Lycra spandex/5% thermo-conductive X-Static. Imported. SIZING: S= men’s shoe size 6-9, women’s shoe size 7-9. M= men’s shoe size 9-11, women’s shoe size 9-11. L= men’s shoe size 11-13, women’s shoe size 11-13.

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