The Run Shirt 4.0 offers ultimate comfort with superior sustainability. Made from 90% recycled material, the new version of our most popular shirt now has improved management with a v-shaped mesh design in the front and back for maximum breathability. While running the front mesh insert allows air to flow through the shirt and around you to exit out the back creating a cooling air channel. This energetic design targets all the hot spots while providing a soft feel and seamless fit.