Our FR Primo collection delivers on-the-job protection using premium, inherently flame-resistant materials. This baselayer gives you room to move with thoughtfully placed seams and an extra-long back hem. We also added permanent odor-resistance so you'll stay fresh, longer. FR Primo Baselayer Product Features : Greater Arm Mobility™ helps extend arm and shoulder range-of-motion so you can move freelyFUZE™ helps provide permanent, chemical‑free odor resistance for long-lasting freshness, Articulated elbowsRaglan constructionLong back hem helps provide extra coverage while you bend, stretch, or reach Men's Flame-Resistant Primo Baselayer Pants in Heather Grey, Size: MT by Ariat