time to run Men's Short Sleeved Compression Top Performance compression fabric. 70D circular knit for added performance and durability. Moves moisture away from the skin so helping you to stay dry. Compression fit and fabric helps to prevent the build up of lactic acid so allowing you to perform at higher levels for longer periods. Muscle groups benefit from enhanced circulation in the same way that circulation socks work thus helping to reduce both muscle fatigue and speed up recovery time. Flat seam construction ensures optimum comfort.