Shop Unisex's at RalphLauren.com, the Official Site of Ralph Lauren. RLX Tennis Polo - This ultra-lightweight tennis polo shirt is crafted from a moisture-wicking microfiber mesh and accented with our signature logo at the chest. Ribbed polo collar. Two-snap placket. Sewn short sleeves. Mesh panels at the sides. Screen-printed "RLX" logo at the left chest. 100% polyester. Collar: 91% polyester; 9% elastane. Machine washable. Imported. Ralph Lauren is proud to be an Official Sponsor of the US Open.