Swix Universal Pant
Here's what other sites are saying:
Whether your kid has been on skis since he could walk or you are just introducing him to the sport of nordic skiing, the Swix Boys' Universal Pants are great for leisurely days on the track or days spent taking in the sights on a cross-country tour. Treated with a DWR to shed moisture, the pants are also fitted with stretch panels at the seat thighs, and lower legs, for maximum range of movement while he's in a glide. A mesh lining helps to maintain breathability, while full-length side zips allow him to lose even more heat on especially warm days.
The Swix Universal Pants for kids offer protection and comfort for cool-weather pursuits and offer full-length zippers for venting and easy on/off.