Designed to fit snug, Simply Merino thermal bottoms work great as a layer under all of your kid's favourite activity gear (hockey, skiing, skating, sledding, hiking, camping, etc). The natural fabric breathes, helping control body temperature, and wicks moisture away from the skin keeping bodies dry and warm.

Fit is true to size. Size up for growing kids. 

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How are these different than the PJ's? Our thermal bottoms have straighter and longer legs making them a tighter fit than our PJ bottoms.