Viking's Flame Resistant Journeyman 300D Ripstop Insulated High Visibility work Overalls are designed for superior protection when you need it. Built with heavy-duty FR-treated 300 denier Trilobal rip-stop polyester with PU backing, these bibs are puncture, rip, snag, and abrasion-resistant. In addition, they feature 250 gsm ThermoMAXX® Insulation for temperatures as low as -50°C / -60°F and are waterproof and windproof.