The Ergodyne® CORE Performance Work Wear Base Layer/Thermal Long Sleeve Shirt is made of medium weight stretch fabric with exceptional moisture control and other technologies to keep you comfortable and warm on the job. Also incorporates 50+ UPF protection, reflective accents, stretch fabrics and comfortable flat seams for improved range of motion. Designed for road and building construction, iron & steel work, oil/gas refining, drilling, mining, freight/baggage, warehouse and landscaping applications. Colors: Black and Gray. Sizes: M3XL.