My child has 6 of these. He has been wearing the 4T size for the last 2 winters and they will fit this winter as well. 3 years for a shirt for a growing preschooler!!!!!! Unheard of! The shirts look exactly the same as they did the day they arrived. Incredibly durable and sized long in the arms and length. We buy 2 for every winter and could not be happier. I wish I had only ever bought these. He wears the size 5 and 6 as regular shirts and can still fit in the 4T as a base layer. I cannot recommend them enough. Seriously super durable.
I love these shirts and will definitely be investing in more. They are versatile for layering or wearing on their own.
We got a complete base layer mostly because it went well under a Halloween costume and I hoped it would be helpful cross country skiing also. My daughter LOVES it and has already gotten my money's worth in one season. She wore it skiing but quickly started wearing as PJs and "to be cozy" at home. It has been holding up great (though I don't wash it often). We sized up so it will last more winters.
I love merino tanks/undershirts. This one stretches out after wearing it for a day and it stays stretched out until washing. I don't like to wash wool too often, so it feels a bit too big most of the time (until it has been washed and shrunk back to its original size). The fabric under the armpits also flares out, so this makes it a bit loose under the arms. It would be nice if it were more snug in this area. A friend of mine also made the same comment about these tank tops (she has the same ones as I do).
We’re so stoked about this undershirt we bought another. Our 2.5 yo wears them every day (2T size). It makes us feel confident that amid the snow and rain he’ll stay warm, even if his other layers get wet. And because it’s merino he’ll wear it all week before it goes through the wash. This is a critical piece of clothing in his wardrobe.