Fabric: Lightweight and breathable, the iQ Series® Comfort Woven Lightweight shirt with Insect Shield® is made with the world's most comfortable FR fabric. It features full underarm gussets, allowing the garment to move with you without riding up, restricting your movement or coming untucked. We've made it even better, with insect protection to keep you even more comfortable as you work. It has larger chest pockets for more storage, and the protection level is easily visible on the sleeve with exterior CAT2 and 2112 labels. Insect protection lasts through 50 home washes.