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 14 Zip Baselayer Product Features : 0 : Greater Arm Mobility™ lets you move freelyFUZE™ permanent and chemical-free odor-resistance, 1 : Long back hem helps keep you covered while you bend and stretchArticulated elbowsErgonomic thumbholesRaglan construction Men's FR Primo 14 Zip Baselayer in Heather Grey, Size: MT by Ariat