This model has 3 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.
PRISMA and HELIOS use fixed leg loops in the reviewed charts, so thigh range is a hard shortlist boundary rather than an adjustment to solve later. The charts contain overlaps, but a compatible waist does not compensate for a thigh measurement outside the stated band.
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
Try the exact model and size with intended clothing. Fixed loops make a weighted comfort check especially important. 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.