Cool Chef Periodic Table Adult Mesh Trucker Hat Cap Material: 100% Polyester Foam Front; 100% Nylon Mesh Back This Baseball Cap Features A Mesh Back And Adjustable Plastic Snap Strap Adult Size, Circumference Adjustable Length: 17~24 Inches Sweatband Keeps Your Head Dry By Drawing Moisture Away From Your Skin USPS ONLY And Normally Takes 6-12 Business Days