Long hours, long distances, incessant impact: the distance runner and the triathlete know all about this. The RX300 retains the lightweight fit that many athletes prefer but with an added impact-absorbency cushion in the sole to help minimize the punishment on the feet when they repeatedly pound against the ground. We also included flat-knit mesh paneling, a full arch support, and TCK's proDRI^&trade system for insulation, moisture management, and protection against bacteria and odor.

Popular Uses:

• Running, Triathlons, Cycling, Hiking, and Training

Performance Features:

• TCK's proDRI^&trade system insulates and manages moisture while fighting odor and bacteria


• Double welt top for comfort and fit


• Ergonomic sole cushioning for comfort and impact absorbency


• Arch support reduces foot fatigue and increases circulation


• Mesh instep aids in breathability


• Smooth toe seam adds comfort


• Available Colors: White

Sock Contents:

• 90% Polypropylene


• 8% Nylon


• 2% Lycra ^®

Care Instructions:

• Polypropylene is a hydophobic fabric best preserved when machine washed and dried on low heat for 10 minutes. No Bleach. Launder inside out to prevent pilling and fuzzing.