Sizing chart for the underwear GT2i / Sparco T-shirt:
| Bust size (cm) | Universal size | European size |
| 76 to 79 | XS | 40 |
| 80 to 88 | S | 42 |
| 89 to 97 | M | 44/46 |
| 98 to 106 | L | 48/50 |
| 107 to 115 | XL | 52/54 |
| 116 to 124 | XXL | 56/58 |
Sizing chart for the underwear Alpinestars T-shirt:
| Bust size (cm) | Size |
| 88/96 | XS/S |
| 92/96 | S |
| 96/102 | M |
| 96/106 | M/L |
| 102/106 | L |
| 106/110 | XL |
| 106/118 | XL/XXL |
Sizing chart for the underwear GT2i / Sparco bottom:
| Waistline (cm) | Universal size | European size |
| 86 to 91 | S | 46/48 |
| 97 to 102 | M | 50/52 |
| 107 to 112 | L | 54/56 |
| 116 to 120 | XL | 58/60 |
| 120 and + | XXL | 62 |
Sizing chart for the underwear Alpinestars bottom:
| Waistline (cm) | Size |
| 74 to 82 | XS/S |
| 78 to 82 | S |
| 82 to 88 | M |
| 82 to 92 | M/L |
| 88 to 92 | L |
| 92 to 98 | XL |
| 92 à 104 | XL/XXL |
Sizing chart for the FIA Socks:
| Shoe size (cm) | Size |
| T36 to 39 | S |
| T39 to 42 | M |
| T42 to 46 | L |
| T46 and + | XL |