XGO Phase 4 Men's Long Sleeve Zip w/Thumb Loop Desert Sand Medium 4P11DQ-M-700. This Flame Resistant XGO Shirt meets or exceeds all ASTM D6413 standards. The XGO Men's FR Phase 4 zip-mock is constructed with patented UPF 50 + Rayon fire resistant outer shell heavy weight Modacrylic (Modacrycler) and Rayon (Teflon) fibers with XGO Nano-Air Dry wicking technology. This Xgo Mens Flame Resistant Shirt has a clean seam next-to-skin comfort with rolled shoulders and underarm gussets for increased mobility. The Xgo Shirt is tagless with long sleeves and a clean seam. With a zipper garage cover that eliminates irritation under the chin when fully unzipped the X-Go Men's Flame Retardant Shirt is perfect for those long cold days at the workbench. Specifications for XGO Heavyweight Performance Zip Mock PH4 Baselayers: Manufacturer: XGO Sleeve Length: Long Sleeve Age Group: Adults Apparel Fit: Athletic Gender: Male Application: Baselayer Top Additional Features: UPF Sun Protection Rating - 50 Fabric/Material: 86percent Acclimate Dry Polyester / 14percent Spandex Weight: 8 oz Condition: New Design/Pattern: Ag47 Anti-Microbial Protection Fastener/Closure Type: 1/4 Zip Mock Pre-Shrunk: Yes Moisture Wicking: Yes Quantity: 1 Sleeve Type: Long Sleeve Features of XGO Heavyweight Performance Zip Mock PH4 Baselayers Tech Face SmoothFace Brushed Fleece Next-To-Skin SuperiorAcclimateDry Moisture Management Ag47Anti-Microbial Protection Clean SeamNext-To-Skin Comfort 9in Zipper For Added Ventilation. Zipper Garage Cover Eliminating Irritation Under The Chin When Fully Zipped Rolled Shoulders - Removes Seam Off Shoulder Eliminating Plate Carrier/Pack Friction/Irritation Under Arm Gussets - Increased Mobility / Reduced Irritation Accessible Elastic Thumb Loops For Added Support When Needed For Layering. UPF UV Protection - 50+ Extra Length (Body) Durable Breathable & Wont Shrink Package Contents: XGO Heavyweight Performance Zip Mock PH4 Baselayers Phase 4 Performance Zip Mock