58% Polyester / 30% Recycled Polyester / 12% Elastane Opti•Dri™ Wicks Away Moisture To Keep You Dry. Stretch To Give Full Range Of Motion Ribbed Collar Single Knit Fabrication Creates A Lightweight Material That Is Flexible And Comfortable Opti Dri™ Wicks Away Moisture To Keep You Dry Stretch To Give Full Range Of Motion Model Is 6'1" And Wears Size Medium Machine Wash Opti-Dri™ Transfers moisture away from your body to keep you cool and dry.