Simms Solarflex provides excellent comfort with its COR3 fabric tech for extended time spent on the water. In addition, flat seam construction enhances comfort; a high-backed collar bolsters sun protection where it counts; and raglan sleeves promote unrestricted movement through the arms and upper torso.Simms Solarflex LS Crewneck Features: Updated fabric with a new UPF50 rating for maximum comfort & sun protection on and off the waterSimms' COR3(TM) fabric technology - wicking, antimicrobial & UPF50Flat seam construction for maximum comfortRaglan sleeve design for unrestricted movement