100% cotton twill. 150gsm. Wide back yoke with concealed mesh, cooling gussets at under arm. JB's reflective tape stands up to 50 times domestic wash. Complies with AS/NZS 4399: 2017 for UPF protection (UPF 50+). Complies with standards AS/NZS 1906.4: 2010; and AS/NZS 4602.1: 2011 Day & Night. Curved hem with back tail styling