5 oz./yd2 / 172 gsm, 100% polyester face plaited to 60% polyester, 40% cotton back (total overall garment 61% polyester, 39% cotton); 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; Matching flat-knit collar with contrast double tipping; Side vents; Active fit; Easy care;