5 oz./yd2 / 172 gsm, 100% polyester face plaited to 60% polyester, 40% cotton back. Proprietary dual-sided mesh pique knit constructed of fine denier wicking polyester on the outside and soft-as-cotton wicking blend on the inside. Moisture-wicking performance with UV 15-39 protection. Feature: Matching flat-knit collar. Side vents. Luxury, comfort and performance in one. Dyed-to-match 3 button placket. Colour: True Royal. RBC Shield Keyline heat transferred on left bicep.