S: Original Waist Circumference 10.8" * 2 = 21.6", Crotch Depth Of 7.5" Proposed 1.6 Feet To 1.8 Feet Waist, Weight 70-88 Pounds M: Original Waist Circumference 11.6"* 2 = 23.2", Crotch Depth 7.8" Proposed 1.8 Feet To 2.4 Feet Waist, Weight 90-110 Pounds L: Original Waist Circumference 12.4" * 2 = 24.8", Crotch Depth 8.3" Proposed 2.0 Feet To 2.6 Feet Waist, Weight 110-130 Pounds XL: Original Waist Circumference 13i"* 2 = 26", Crotch Depth 8.7" Recommended 2.4 Feet To 2.9 Feet Waist, Weight 130-145 Pounds