FXD WP-4 Work Trousers Certified UPF 50+ blocking both UVA and UVB rays. The ultraviolet protection factor is measured by the Auatralian Radiation Protection and Nuclear Safety Agency. UPF50+ is the highest rating category in accordance with the Australian standard for sun protective fabrics AS/NZS 4399. 295gsm / 8.8 oz. 4-way mechanical stretch peached cotton fabric. Elastic cuffs on the leg ends. Dura500 reinforced pockets. Back yoke and knee stretch panels. Double layer internal pocket bags. Dura500 attachment loop. YKK zip fly. Triple needle stitched seams. FXD is from an Australian stable of exceptionally well crafted board and streetwear. The FXD name has taken the work-wear market by storm south of the equator.