Our O-tops are traditional orienteering shirts made of O-VENT mesh fabric or O-AIR polyester fabric depending on whether you want a sewed or digital printed design. Both fabrics are strong with extremely good ventilation. Regardless of what kind of design you chose the O-tops are all loose fitted with a comfortable elastic collar. This is a shirt that everybody enjoys in warm summer weather. If you catch a chill easily during competitions in early spring or late fall, then this shirt is perfect with our Skinlife Pro underwear underneath. Available in unisex fit.