Primo Infinity Sports Bra Size Guide
Find your size below. The Primo Infinity Sports Bra is a lighter, lower-cut racerback bra with adjustable straps — built for lower-impact training, conditioning and warm-ups. The figures below are garment measurements taken flat across each panel. Choose by chest, then verify the underband, length and strap measurements suit your frame. The Infinity bra runs one size smaller than the Air bra so size up if you usually wear the Air bra.
| Size | Length | Waist | Chest | Strap |
|---|---|---|---|---|
| X Small | 7.5 | 22.0 | 24.0 | 10.3 |
| Small | 7.9 | 24.0 | 26.4 | 10.6 |
| Medium | 8.3 | 26.0 | 28.4 | 11.0 |
| Large | 8.7 | 28.0 | 30.4 | 11.4 |
| X Large | 9.1 | 30.0 | 32.4 | 11.8 |
How to measure
- Length — Lay the bra flat and measure from the underarm seam straight down to the bottom band hem.
- Waist — Lay flat and measure across the underband from edge to edge. The fabric stretches comfortably around the rib cage.
- Chest — Lay flat and measure across the chest panel from edge to edge.
- Strap — Measure the length of one shoulder strap from front anchor to back anchor.
