DRIFIRE FR-L1 Performance Short Sleeve Tan 499 Extra Large. Our high stretch material and light compression-style fit create the ultimate next to skin comfort. Phase change technology proactively regulates skin temperature and reduces perspiration up to 34percent. Stay cool when the mission heats up with our next generation of flame-resistant base layers. Specifications for DRIFIRE FR-L1 Performance Short Sleeve: Manufacturer: DRIFIRE Age Group: Adults Gender: Unisex Application: Outdoor Fabric/Material: Ultra-Lightweight Knit Weight: 4.5 oz Features of DRIFIRE FR-L1 Performance Short Sleeve Lightweight soft FR-L1 fabric reduces chafing and maximizes comfort Exterior FR compliance label Dropped flatlock seams for no-rub comfort Ribbed collar maintains shape Perfect base layer for other DRIFIRE garments FR Base Layer 1 (FRL1) Inherent and permanent flame resistance moisture management and odor control Dries up to three times faster than cotton Berry Compliant Package Contents: DRIFIRE FR-L1 Performance Short Sleeve DRIFIRE DF4-606TS-TN-XL: FR-L1 Performance Short Sleeve Tan 499 Extra Large