Fox designed the mens Flexair muscle tank for a lightweight, unrestrictive fit using the same passion for technical innovation as our performance racewear. When you throw on the Flexair tank, the feeling of comfort and mobility is immediate. The Fox proprietary TruDri fabric blend is super-soft, yet exceptionally durable. The high-stretch content allows the Tank to move naturally for an entirely unrestrictive feel. And lightweight, moisture-wicking properties keep you cool, dry and comfortable even on the warmest of days.