FirstGear TPG Basegear Long-Sleeve Top - 2010 Moisture transport system wicks the sweat from your body keeping you cool and dry Basegear's heat-release mechanism keeps your skin surface as cool as possible to help maintain core body temperature (increases in core body temperature can cause muscle fatigue and slow reaction time) Fabric is 50 lighter than a cotton T-shirt after 60 minutes of exercise It releases 80 if its moisture after 30 minutes of rest, while cotton only releases 35 of its moisture after 30 minutes of rest All seams flat-stitched for added comfort under layering system UV 50 + protection from sun elements, helps control body temperature to reduce fatigue Anti-bacterial protection