5 oz./yd / 172 gsm, 100% polyester face plaited to 60/40 polyester/cotton back (total overall garment 61/39 polyester/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-management performance. Active fit. Matching flat-knit collar with contrast double tipping. Side vents. Easy care. UV 15-39 protection.