Bests & Worsts Reviews from Amazon

I bought a large for my 9 year old. It fit perfectly and kept him warm in cold temperatures that almost hit freezing. We did a lot of walking outside and it was sufficient. He's a taller than average but skinny 9 year old, and his jeans usually need an adjustable waist to cinch them up. The thermals were long enough for his tall frame and fit his waist. So, they're made for skinnier frames but are stretchy. Hope this helps someone with sizing. I always get him a size larger in pants so that they are long enough.