The statistic survives every retelling: the large majority of women wear the wrong bra size — and in sports bras, wrong size means wrong SUPPORT, which the high-impact guide’s engineering can’t fix from inside the wrong envelope. The professional fitting, demystified and endorsed.

The Wrong-Size Epidemic

The classic drift: sizes chosen years ago, bodies changed since (weight, workouts, pregnancies — all re-size the equation), plus the band-too-big-cup-too-small pattern that dominates the statistics. The symptom checklist: riding bands, digging straps, spillage or gaping, and support that requires strap-tightening heroics.

The Appointment Reality

The fitting demystified: measured over clothes or a bra (the topless fear is outdated at most fitters), ten minutes, zero judgment (fitters have seen every body and every ancient bra — yours is Tuesday to them), and the multi-size tryout that follows the tape (the tape starts the conversation; the fit finishes it). Sports-specific fitters exist at running and athletic retailers.

The Band-Cup Trade Math

The fitting’s core lesson: band and cup trade against each other (the sister-size system) — the 34 band’s C cup equals the 36’s B in volume; support comes 80% from the BAND (the posture guide’s fact, refitted). The classic correction: band DOWN a size, cup UP one — the snugger band doing the work the straps were failing at.

The Refit Rhythm

Sizes are subscriptions, not tattoos: refit yearly-ish and at every body change (the postpartum refit is practically mandatory; the new-training-era refit close behind). The properly-fitted sports bra converts every workout after it — the ten-minute appointment out-performs every $70 bra bought in the wrong size.

Assume drift, book the ten minutes, trust the band-down-cup-up math, refit at changes. The support was never missing from the market — it was missing from the size, and the tape measure knows.