The Thermal Dispersion Tee, made to harness your body’s evaporative cooling. Most perforated tees use a uniform pattern, spreading holes evenly which limits their density and size. The TD Tee's ventilation is body-mapped to your highest heat zones. This allows us to get the most airflow where needed while leaving the shirt very wearable in a lot of environments. The largest, most densely perforated holes run down the center back where heat builds and where a vest would otherwise trap it against your skin. Built to enable you to go further. It's constructed from a 115gsm Italian-knit microfiber that's cool to the touch with four-way stretch, delivering lightweight comfort when the effort is anything but. Ultra-Lightweight Four-Way Stretch Cool-to-Touch, Breathable, Fast-Dry Construction Body-Mapped Laser-Cut Perforations Reflective Branding