Our son is just over 3 years old. These XS size mittens fit him but are a bit big so I would say the sizing is accurate. The mittens themselves feel well tailored, warm and still dry as he played with the snow. They fit under the cuffs of his winter jacket, which seems to help put them on, even though they're a bit too big for him. However, they may not work well with very tight sleeves.
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