Joe Rocket Mens Alpha Pants Size Chart
Size Small Medium Large X-Large 2X-Large 3X-Large 4X-Large 5X-Large
Waist 30 - 31 32 - 33 34 - 35 35 - 38 38 - 41 41 - 44 45 - 47 48 - 50
Inseam Regular 34 34 34 34 34 34 34 34
For tall sizes, add 2" to the length and for short sizes subtract 2" to the length.

Joe Rocket Mens Numerical Pants Size Chart
Size/Waist 30 32 34 36 38 40 42
Stealth Sport Inseam 30 7/8 31 1/4 31 5/8 32 32 3/8 32 3/4 33 1/8
Accelerator Denim Jeans regular inseam is 32" and short sizes inseam is 30".

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WAIST
Measure around the narrowest part (typically the small of your back where your body bends side to side), keeping the measuring tape horizontal.
INSEAM
Measure from the base of the crotch, along the inside of your leg and down to your ankle. An easier way is to take a pair of pants that fit you well and measure the inner leg inseam.