[Size]: Two different size for your choose,S(47-50CM/18.5"-19.68") fits 1-2Years,M(50-52CM/19.69"-20.47") fits 2-4Years. [MATERIAL]:Cotton/Polyester material and 6 ventilation eyelets. [DESIGN]:Unisex Classic design,Adjustable Buckle Strap,Well Ventilated Cotton Fabric,Low Profile,Lightweight [Feature]:it's very soft and comfortable for kdis,and easy to wear.And HAND WASH is suggested. [Occasions]: Baseball hat for Children playing outdoor activity,climbing,camping,sporting events,picnics,beach activities,anything under the sun.