Here in youth sizes, UpHillSport “Valta” Alpine Ski 4 Layer M5 Socks offer exceptional insulation against extreme cold. These knee-length multilayer skiing and snowboarding socks are mid-weight socks but with a four-layer construction that combines naturally breathable, warm merino wool with performance synthetic fibres than can hold heat in while also transferring moisture away for drier skin. Valta’s foot section has a merino wool terry loop cushioned sole, with a seamless toe for blister prevention, a fitted heel and arch band for grip to keep the socks in place and wrinkle-free. All Uphill Sport socks incorporating merino wool come from mulesing free farming sources.