Advanced Comfort moves with you. This unique fabric construction, exclusive to The Wrangler Brand, features 4-way flex for a comfortable fit and added mobility as you work. Durable and dependable, Advanced Comfort Denim lasts two times longer. Wrangler FR garments are certified by Underwriters Laboratories to meet the requirements of NFPA 2112 Standard on Flame Resistant Garments for Protection of Industrial Personnel Against Flash Fire, 2012 edition.