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Size | US Band/Cup | Bust (in/cm) | Underbust (in/cm) |
---|---|---|---|
XS | 32A–32B | 30–33 in (76–84 cm) |
27–29 in (68–74 cm) |
S | 34A–34C | 33–35 in (84–90 cm) |
29–31 in (74–79 cm) |
M | 36B–36C | 36–38 in (91–97 cm) |
31–33 in (79–84 cm) |
L | 38C–38D | 38–40 in (97–102 cm) |
33–35 in (84–89 cm) |
XL | 40C–40DD | 41–43 in (103–109 cm) | 35–37 in (89–94 cm) |
How to measure:
- Bust = fullest part of chest.
- Underbust = directly under breasts.
Fit tip: Between sizes? Size up for more comfort in high-impact workouts.
Cup guidance: Bras are compressive. Larger cups within a range may prefer sizing up.
Support You Can Trust. Comfort You Can Feel.

Support You Can Trust. Comfort You Can Feel.

Why Runners Choose ALPYN
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Other Running Bras | Everyday Sports Bras | |
---|---|---|---|
High-Impact Bounce Control | |||
Chafe-Free Edges & Seams | |||
Wide, Stay-Put Underband | |||
Secure, Bounce-Free Phone Pocket | |||
Hydration Vest-Friendly Straps | |||
Breathable Mesh Zones |