Johnnie O Specs PoloDescription Our Featherweight Collection is crafted from the lightest jersey fabric weve ever made60 GSM lighter than standard jersey (and trust us, thats a game changer). These polos wick away sweat, regulate heat and have UPF 50 sun protection for those days when the sun is beating down. The fabric also features four way stretch which creates maximum mobility and means never having to break out the iron.