The upgraded foundation.

The P.S.I. Tech S/S is built for long hours in the field without compromise. Constructed from a lighter-weight 91% Recycled Poly / 9% Recycled Spandex blend (140gsm), this tee moves with you from pre-dawn to sundown. VINT Technology pulls sweat away fast and keeps your core temperature in check when heat and activity peak, so you stay focused when it counts. UPF 30+ handles the sun. Relaxed fit handles the rest.