6HWSL JB's Wear Hi Vis Lightweight Work Shirt. JBs Wear Online Australia Wide Delivery JB's L S Stretch Work Shirt 1HT JB's Wear 100% Cotton Short Sleeve Tee Max Global Products Workwear Page 4 of 5 JBS WEAR DIRECT. Made with double pre shrunk lightweight cotton, this Short Sleeve Work Shirt ensures size retention and maximum comfort. It is AS NZS 4399: 2017 for UPF Protection with 50+ rating. This button up industry shirt has cooling vents and mesh gussets for increased breathability to keep you dry and cool. 100% cotton 150 GSM double pre shrunk lightweight drill fabric Complies with standard AS NZS 4399: 2017 for UPF Protection (UPF 50+) Wide back neck yoke with concealed mesh cooling vents Mesh gusset at underarms for added coolness Two piece collar with full button down opening Two front pockets with button down flaps and pen insert