My 2 boys are in the 97th percentile for height and 50th percentile for weight. They are tall and skinny. The oldest, age 8, is wearing size 10 pants and the youngest, age 6, regularly wears size 8, so these are the sizes I bought. I hemmed both pairs up by about 3.5 inches, maybe more, and they worked great. I hope the last for years to come after i let the hem out. I purchased them for a week-long rafting trip. I also purchased the same pant-type from REI and had the same length problem but really liked that the REI pants came with color coded zippers for just a couple bucks more. That is super helpful.