SMALL 10-12 32" - 34"
MEDIUM 12-14 34" - 36" 
LARGE 14-16 37" - 39"
X-LARGE 16-18 42" - 44"
XXL 18-20 45" - 48"
3XL 20-22 54" - 56"
4XL 22-24 58" - 60"
5XL 24-26 62" - 64