Kids' short-sleeve base layers

Functional material dries directly on the body, whereas cotton stays wet and feels cold in the shade. Merino doesn't irritate sensitive skin and doesn't start to smell even after a few days at a cabin, while synthetics can handle being washed every other day and dry quickly on the line. Choose a size so that the top fits, not with an allowance for two years. The same piece will work under a jacket in spring if you add a long-sleeve top on top.