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, but we always recommend sizing up for longer wear.

Looking for smaller sizes? Check out and .

*Our thermal bottoms have straighter and longer legs making them a tighter fit than our PJ bottoms.