Aqua Lung fin strap sizing.
| EU size | US size | Size |
|---|---|---|
| 35–39 | 3–6 | S |
| 40–43 | 6–9 | M |
| 44–47 | 9.5–12 | L |
| 42–47* | 8–12* | XL |
* suited for special boots
From Aqua Lung’s chart: Aqualung fins with adjustable heel straps are designed to fit a range of foot sizes. Feet at the smaller end of the size range may not reach the edge of the fin pocket, while feet at the larger edge of the size range may extend past the edge of the fin pocket. Sizes shown here are estimations
Source: Aqua Lung’s size chart (original chart).