The remarkable sidewinder undulates effortlessly across America's desert southwest, thriving in searing sun, abrasive sand and temperatures that often top 118°F. Just as this awe-inspiring snake has mastered its environment, the DuluthFlex Sidewinder Shirt gives you the agility and heat-handling ability to withstand summer's worst. Its wicking nylon fabric contains 14% spandex that stretches mightily to accommodate every action. And it weighs just 3.2 oz. per yard for a feather-light, barely there feel, yet provides UPF 30 sun protection. Cap sleeves are cool as the mercury climbs. There's even a breathable back cape for heat-dispersing ventilation and underarm gussets for arm-swinging room. Don't hold back — strike now and get yourself the shirt that de-fangs summer discomforts!