Limited Edition Happy Face Slippers Size Chart
| US Size | UK Size | EU Size | Size On The Sole | Foot Length |
| 5.5-6 | 3.5-4 | 35-36 | 36-37 | 22-22.5 |
| 6.5-7 | 4.5-5 | 37-38 | 38-39 | 23-23.5 |
| 7.5-8 | 5.5-6 | 39-40 | 40-41 | 24-24.5 |
| 8.5-9 | 6.5-7 | 40-41 | 42-43 | 25-25.5 |
| 9.5-10 | 7.5-8 | 42-43 | 44-45 | 26-26.5 |
| 10-10.5 | 8.5-9 | 44-45 | 46-47 | 28-28.5 |