Thor youth size 18 or 3t 18 inch waist  Measure the riders waist in inches like a.belt measurement. 3t - range. 2-3 year old normally  This is the smallest size Brand new old stock Save now closeout price ! Genuine Thor quality  Super FAST  same day SHIPPING if possible Many other youth size pants available size 20 available message me if you need help sizing up Message me if you don’t see the size you need Thank you