This model has 4 reviewed size combinations with adjustable leg loops. Match both body measurements to one row; the model name and generation matter more than a familiar letter size.
Cuesta M's is represented by five semi-adjustable rules. Vista Adj uses four adjustable size bands in the reviewed US chart. Cuesta M's and Vista Adj share some waist bands, but Vista Adj lists wider thigh ranges for the corresponding S through XL rows. Select the model first, then check both measurements against that model's row; a waist match alone does not establish fit.
Use the exact source model shown here. A similarly named successor, a different regional listing or another manufacturer's size with the same label is not automatically covered. These are published dimensional ranges, not measurements of a harness under load.
Keep every row containing both measurements as a candidate. A value exactly on a published endpoint remains inside the inclusive range. Distance from the endpoint is a chart fact, not a comfort rating. Do not automatically choose the middle of a range or size down to eliminate an overlap.
If only your waist or thigh fits
Recheck both measurements in the intended clothing. A waist match cannot compensate for a thigh outside the model's stated range. Compare a different model or consult a qualified shop; the calculator does not bridge a gap or extrapolate a missing size.
Confirm the physical fit
Where adjacent rows both match, compare centered waist-belt position, leg-loop comfort, and intended layers during a controlled hang test. Check the exact manufacturer's buckle instructions, waist-belt retention above the hips, rise and movement. Complete a controlled weighted hang test in a shop or gym before relying on the shortlist.
Source and review scope
Earliest review date among this model's rows: . Read the manufacturer source. A recent source check confirms the published numbers, not physical fit or current retail stock. See the full source register for other models.