I bought these Columbia snow pants for my eight year old who had been wearing an old hand-me-down pair that no longer repel water. He wears size 7 jeans and the size 8 fit him, allowing plenty of length to grow but not so long he's tripping over them. He is thin and the adjustable waist is really nice. He's been testing them out and breaking them in these past few days playing in tempts that have dipped down to around -10 degrees with the windchill and with a good 15-16 inches of snow on the ground. He was really excited about his green snow pants and has already logged numerous hours in them sledding, trekking through the woods and building snow forts.