The Columbia Youth Winter Worn Peruvian Hat packs more than just ear-warming flaps, a sweat-wicking ear band keeps little heads dry and snug when the weather s nasty and you just can't keep them indoors. Features:Omni-Wick ear band: High-Performance WickingSize S/M: 19-21" head circumferenceFabric:Shell: 100% acrylic yarnLining: 100% polyester Medium Weight Micro Fleece