The Tri-Tec Performance Base Layer Quarter Zip Shirt by Drake is a hybrid fabric design that creates three different zone that provide greater warmth where it is needed most, and greatest breathability where it is needed. Made of 92% polyester 8% spandex with moisture wicking finish and anti-microbial properties. The Tri-Tec Performance Base layer combines EST, MST and LST base layer fabric weights in distinct temperate zones. LST (10 ounce material) on torso and tops or arms and MST (8 ounce material) on fronts of shoulders forearms and side kidney area. EST technology (5 ounces material) is under arms and on wrists. A great all season layering staple. Features: Tri-Tec is a combination of LST, MST and EST LST on torso and tops of arms MST on fronts of shoulders, forearms and side kidney area EST under arms and on wrists 4-way stretch Anti-microbial Deep quarter zip neck Vertical zippered chest pocket  Made of 92% polyester and 8% spandex Moisture wicking finish and anti-microbial technology

• Tri-Tec is a combination of LST, MST and EST
• MST on fronts of shoulders, forearms and side kidney area
• EST under arms and on wrists
• Made of 92% polyester and 8% spandex
• LST on torso and tops of arms

Tri-Tec is a combination of LST, MST and ESTDrake Waterfowl Systems