This is a size 40 or 2 to 3 years on the label but my 5 and 1/2-year-old It's just getting to be a bit tall for them. These pants are 3 years old and have been incredible. We just had to size up and they have discontinued this specific model. These are RAIN PANTS not snow pants. They are slightly insulated / thick so they do keep him warm on the cool fall days and the cool spring days. anything over 60ish and they're sweaty. We have used these for outdoor school for the past several years and they're amazing. They have three small cosmetic rips that don't go all the way through but I'm assuming things like prickers have caught at certain points. Let me know if you have more questions!