These are great winter trousers and you can tell the designers have done a great job! The trousers have a wide cut so that functional underwear can also be worn underneath. There are Velcro straps at the waist that tighten the belt a bit. My 4 year old wears pants from 4t to 5t and size xxs fits him well but is not too big. The leg ends are reinforced so the pants won't rip there when stretched a little, and the pants have a Columbia Outgrown feature that allows you to lengthen the legs as your child grows. If my little one doesn't have a major growth spurt, I can well imagine him wearing these pants again next season. He skied, formed snow angels and sleds in the snow and stayed completely dry and warm. The only thing I miss is the velcro that fits snugly around the ankle, but they fit well on big snow or ski boots.
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