When should my child switch from junior to adult ski socks?

Transition to adult ski socks when your child is wearing adult-sized ski boots, typically around women's shoe size 5-6 or men's size 4-5. The key indicator is boot size, not age — some 10-year-olds wear adult boots while some 13-year-olds are still in junior sizes. Once in adult boots, use women's-specific socks for girls and men's socks for boys to get the proper heel and calf proportions.