The Sondico Long-Sleeve Core Base Layer Top offers compression construction coupled with an elastic hem for a secure fit while he trains or performs during a game. This base layer top also features Optivent technology for breathability.. . Long sleeves. Optivent technology. Mesh panels. Flatlock seams. Keep away from fire. 92% Polyester, 8% elastane. Machine washable. Imported. 2427390031557 32348300059 427390