Flash Happy Slippers Size Chart
| US size | UK Size | EU Size | International size (Blue & Red) | International size (Yellow) |
| 5.5-6 | 3-3.5 | 35.5-36 | 37-38 | 38-39 |
| 6-6.5 | 3.5-4 | 36-37 | 39-40 | 40-41 |
| 7.5-8.5 | 5-6 | 38-39 | 41-42 | 42-43 |
| 9-9.5 | 6.5-7 | 40-41 | 43-44 | 44-45 |
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