WARNING: California’s Proposition 65
Proposition 65 Warning for California Consumers
Alpinestars Supertech R10 Arius Adult Street Helmets
The result of over 10 years of intensive study, development, and testing, the goal of the Supertech family of helmets is to create the most advanced, protective, and performance-enhancing helmets possible for racers and riders worldwide. Following years of extensive research, development, and testing of the Supertech R10 road racing helmet by Alpinestars' Helmet Product Development Department, together with MotoGP legend Andrea Dovizioso, and MotoGP riders' Jorge Martin, and Jack Miller. With the S-R10, the focus of the design was to ensure the highest level of performance, especially when it comes to protection and a new level of safety. The S-R10 Helmet has been engineered to provide the perfect blend of excellent ventilation, unsurpassed comfort, and the lightest weight possible without compromising on any other front. Another crucial element unique to the S-R10's design and development is the helmet's advanced aerodynamics, with countless sessions in the wind tunnel aimed at reducing drag and providing optimal aerodynamic stability.


















New or Brand New - Brand new item in original packaging (original manufacturer's warranty may apply).
Refurbished - Professionally restored and in perfect working condition. Original packaging may be missing or slightly damaged.
Used - Item has seen limited use but remains in good working condition. May show some limited signs of wear with small scratches or cosmetic blemishes. May arrive with damaged packaging or be repackaged.
Refurbished, Without Tags - Same as refurbished. Item may arrive with mising labels or tags.
Refurbished, Last Call - Same as refurbished. Last call or closeout item.
Measure around the fullest part, under the armpits, keeping the tape horizontal.
Measure around the natural waist line, inline with the navel, keeping the tape horizontal.
Measure around the fullest part of your hips, about 20cm below waist line, keeping the tape horizontal.
Measure around the thigh just below the crotch, keeping the tape horizontal.
Stand against a wall, ask someone else to measure from the crotch to the bottom of your leg.
Measure from shoulder (Humerus) to wrist.
Stand against a wall, ask someone else to measure from the oor to the top of your head, keeping the tape vertical.
| Euro Size | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 58 | 60 | 62 | 64 |
| International Size | XXS | XXS | XS | XS | S | S | S | M | M | L | L | XL | L | XL | XL | XXL | XXL | XXL | 3XL | 3XL | 4XL |
| U.S. Size | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 |
| U.S. Pant Size | 24 | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 |
| A | Chest (Inches) | 30 3/4- 32 1/4 | 32 1/4- 33 7/8 | 33 7/8- 35 3/8 | 35 3/8- 37 | 37 - 38 5/8 | 38 5/8- 40 1/8 | 40 1/8- 41 3/4 | 41 3/4- 43 1/4 | 43 1/4- 44 7/8 | 44 7/8- 46 1/2 | 46 1/2- 48 | 48 - 49 5/8 | 49 5/8- 51 1/8 |
| B | Waist (Inches) | 25 1/4- 26 3/4 | 26 3/4- 28 3/8 | 28 3/8- 29 7/8 | 29 7/8- 31 1/2 | 31 1/2- 33 1/8 | 33 1/8- 34 5/8 | 34 5/8- 36 1/4 | 36 1/4- 37 3/4 | 37 3/4- 39 1/4 | 39 1/4- 41 | 41 - 42 1/2 | 42 1/2- 44 1/8 | 44 1/8- 45 5/8 |
| C | Hip (Inches) | 31 1/8- 32 5/8 | 32 5/8- 34 1/4 | 34 1/4- 35 7/8 | 35 7/8- 37 3/8 | 37 3/8- 39 | 39 - 40 1/2 | 40 1/2- 42 1/8 | 42 1/8- 43 3/4 | 43 3/4- 45 1/4 | 45 1/4- 46 7/8 | 46 7/8- 48 3/8 | 48 3/8- 50 | 50 - 51 5/8 |
| D | Thigh (Inches) | 19 3/8- 19 5/8 | 19 5/8- 20 1/8 | 20 1/2- 20 7/8 | 21 1/4- 21 5/8 | 22 - 22 1/2 | 22 7/8- 23 1/4 | 23 5/8- 24 | 24 3/8- 24 3/4 | 25 1/4- 25 5/8 | 26 - 26 3/8 | 26 3/4- 27 1/8 | 27 1/2- 28 | 28 3/8- 28 1/2 |
| E | Inseam (Inches) | 28 - 28 3/4 | 28 3/4- 29 1/8 | 29 1/2- 29 7/8 | 30 3/8- 30 3/4 | 31 1/8- 31 1/2 | 31 7/8 - 32 1/4 | 32 5/8 - 33 1/8 | 33 1/2 - 33 7/8 | 34 1/4 - 34 5/8 | 35 - 35 3/8 | 35 - 35 3/8 | 35 7/8 - 36 1/4 | 35 7/8 - 36 1/4 |
| F | Outer Arm (Inches) | 19 1/4 - 20 1/8 | 20 1/8 - 20 3/4 | 20 7/8 - 21 1/4 | 21 5/8 - 22 | 22 1/2 - 22 7/8 | 23 1/4 - 23 5/8 | 24 - 24 3/8 | 24 3/4 - 25 1/4 | 25 5/8 - 26 | 26 3/8 - 26 3/4 | 26 3/8 - 26 3/4 | 27 1/8 - 27 1/2 | 27 1/8 - 27 1/2 |
| G | Height (Inches) | 4'11" - 5'1" | 5'2" - 5'4" | 5'4" - 5'5 | 5'6" - 5'7" | 5'7" - 5'8" | 5'9" - 5'10" | 5'11" - 6'" | 6" - 6'2" | 6'2" - 6'3" | 6'3" - 6'5" | 6'3" - 6'5" | 6'5" - 6'6" | 6'5" - 6'6" |
| Euro Size | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 | 56 | 58 | 60 | 62 | 64 |
| International Size | XXS | XXS | XS | XS | S | S | S | M | M | L | L | XL | L | XL | XL | XXL | XXL | XXL | 3XL | 3XL | 4XL |
| U.S. Size | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 |
| U.S. Pant Size | 24 | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 | 42 | 44 | 46 | 48 |
| A. Chest (cm) | 78 - 82 | 82 - 86 | 86 - 90 | 90 - 94 | 94 - 98 | 98 - 102 | 102 - 106 | 106 - 110 | 110 - 114 | 114 - 118 | 118 - 122 | 122 - 126 | 126 - 130 |
| B. Waist (cm) | 64 - 68 | 68 - 72 | 72 - 76 | 76 - 80 | 80 - 84 | 84 - 88 | 88 - 92 | 92 - 96 | 96 - 100 | 100 - 104 | 104 - 108 | 108 - 112 | 112 - 116 |
| C. Hip (cm) | 79 - 83 | 83 - 87 | 87 -91 | 91 - 95 | 95 - 99 | 99 - 103 | 103 - 107 | 107 - 111 | 111 - 115 | 115 - 119 | 119 - 123 | 123 - 127 | 127 - 131 |
| D. Thigh (cm) | 48 - 49 | 50 - 51 | 52 - 53 | 54 - 55 | 56 - 57 | 58 - 59 | 60 - 61 | 62 - 63 | 64 - 65 | 66 - 67 | 68 - 69 | 70 - 71 | 72 - 73 |
| E. Inseam (cm) | 71 - 72 | 73 - 74 | 75 - 76 | 77 - 78 | 79 - 80 | 81 - 82 | 83 - 84 | 85 -86 | 87 - 88 | 89 - 90 | 89 - 90 | 91 - 92 | 91 - 92 |
| F. Outer Arm (cm) | 49 - 50 | 51 - 52 | 53 - 54 | 55 - 56 | 57 - 58 | 59 - 60 | 61 - 62 | 63 - 64 | 65 - 66 | 67 - 68 | 67 - 68 | 69 - 70 | 69 - 70 |
| G. Height (cm) | 150 - 156 | 157 - 163 | 164 - 167 | 168 - 171 | 172 - 175 | 176 - 179 | 180 - 183 | 184 - 187 | 188 - 191 | 192 - 195 | 192 - 195 | 196 - 199 | 196 - 199 |
| Europe | 38 | 39 | 40.5 | 42 | 43 | 44.5 | 45.5 | 47 | 48 | 49.5 | 51 | 52 |
| USA | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Japan | 24 | 25 | 25.5 | 26.5 | 27.5 | 29 | 29.5 | 30.5 | 31.5 | 32.5 | 33.5 | 34.5 |

Measure around the chest under the armpits, keeping the tape horizontal.
Measure around the fullest part of the bust, keeping the tape horizontal.
Measure around the natural waist line, inline with the navel, keeping the tape horizontal.
Measure around the fullest part of your hips, about 20cm below waist line, keeping the tape horizontal.
Measure around the thigh just below the crotch, keeping the tape horizontal.
Stand against a wall, ask someone else to measure from the crotch to the bottom of your leg.
Measure from shoulder (Humerus) to wrist.
Stand against a wall, ask someone else to measure from the floor to the top of your head, keeping the tape vertical.
| Euro Size | 36 | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 |
| International Size | XXS | XXS | XS | XS | S | M | L | L | XL | XL | XXL | XXL | XXL | 3XL | 3XL |
| U.S. Size | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 |
| U.S. Pant Size | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 |
| A. Chest (Inches) | 29 1/8 - 30 3/4 | 30 3/4 - 32 1/4 | 32 1/4 - 33 7/8 | 33 7/8 - 35 3/8 | 35 3/8 - 37 | 37 - 38 5/8 | 38 5/8 - 40 1/8 | 40 1/8 - 41 3/4 | 41 3/4 - 43 1/4 | 43 1/4 - 44 7/8 |
| B. Bust (Inches) | 30 3/4 - 32 1/4 | 32 1/4 - 33 7/8 | 33 7/8 - 35 3/8 | 35 3/8 - 37 | 37 - 38 5/8 | 38 5/8 - 40 1/8 | 40 1/8 - 41 3/4 | 41 3/4 - 43 1/4 | 43 1/4 - 44 7/8 | 44 7/8 - 46 1/2 |
| C. Waist (Inches) | 22 7/8 - 24 3/8 | 24 3/8 - 26 | 26 - 27 1/2 | 27 1/2 - 29 1/8 | 29 1/8 - 30 3/4 | 30 3/4 - 32 1/4 | 32 1/4 - 33 7/8 | 33 7/8 - 35 3/8 | 35 3/8 - 37 | 37 - 38 5/8 |
| D. Hip (Inches) | 32 1/4 - 33 7/8 | 33 7/8 - 35 3/8 | 35 3/8 - 37 | 37 - 38 5/8 | 38 5/8 - 40 1/8 | 40 1/8 - 41 3/4 | 41 3/4 - 43 1/4 | 43 1/4 - 44 7/8 | 44 7/8 - 46 1/2 | 46 1/2 - 48 |
| E. Thighs (Inches) | 19 5/8 - 20 1/8 | 20 1/2 - 20 7/8 | 21 1/4 - 21 5/8 | 22 - 22 1/2 | 22 7/8 - 23 1/4 | 23 5/8 - 24 | 24 3/8 - 24 3/4 | 25 1/4 - 25 5/8 | 26 - 26 3/8 | 26 3/4 - 27 1/8 |
| F. Inner Legs (Inches) | 28 3/8 - 28 3/4 | 29 1/8 - 29 1/2 | 29 7/8 - 30 3/8 | 30 3/4 - 31 1/8 | 31 1/2 - 31 7/8 | 32 1/4 - 32 5/8 | 33 1/8 - 33 1/2 | 33 1/8 - 33 1/2 | 33 7/8 - 34 1/4 | 33 7/8 - 34 1/4 |
| G. Outer Legs (Inches) | 19 5/8 - 20 1/8 | 20 1/2 - 20 7/8 | 21 1/4 - 21 5/8 | 22 - 22 1/2 | 22 7/8 - 23 1/4 | 23 5/8 - 24 | 24 3/8 - 24 3/4 | 24 3/8 - 24 3/4 | 25 1/4 - 25 5/8 | 25 1/4 - 25 5/8 |
| H. Height (Inches) | 5'2"- 5'3" | 5'4"- 5'5" | 5'5"- 5'6" | 5'7"- 5'8" | 5'8"- 5'9" | 5'10"- 5'11" | 5'11"- 6'" | 5'11"- 6'" | 6'1"- 6'2" | 6'1"- 6'2" |

| Europe | 37 | 38 | 39 | 41 | 42 |
| USA | 6 | 7 | 8 | 9 | 10 |
| Japan | 23 | 24 | 25 | 26 | 26.5 |

| Measurement | Letter Sizing | Numeric Sizing |
|---|---|---|
| 2 1/8" - 2 5/8" | XS | 7 |
| 2 5/8" - 3 1/8" | SM | 8 |
| 3 1/8" - 3 5/8" | MD | 9 |
| 3 5/8" - 4 1/8" | LG | 10 |
| 4 1/8" - 4 5/8" | XL | 11 |
| 4 5/8" - 5 1/8" | XXL | 12 |
| 5 1/8" - 5 5/8" | XXXL | 13 |

| US | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| EU | 38 | 39 | 40.5 | 42 | 43 | 44.5 | 45.5 | 47 | 48 | 49.5 | 51 | 52 |
| US | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| EU | 38 | 39 | 40.5 | 42 | 43 | 44.5 | 45.5 | 47 | 48 | 49.5 | 51 | 52 |
| Size | A. CHEST | B. WAIST | F. OUTER ARM | G. HEIGHT | ||||
|---|---|---|---|---|---|---|---|---|
| US | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters |
| XXS | 30 3/4 | 78 | 24 3/4 | 63 | 19 1/4 | 49 | 61 3/4 | 157 |
| XS | 32 7/8 | 83.5 | 27 1/8 | 69 | 20 1/8 | 51 | 63 3/4 | 162 |
| S | 32 7/8 | 83.5 | 27 1/8 | 69 | 20 1/4 | 51.5 | 64 1/8 | 163 |
| M | 35 | 89 | 29 1/2 | 75 | 21 | 53.5 | 66 1/8 | 168 |
| L | 37 1/4 | 94.5 | 31 7/8 | 81 | 21 1/2 | 54.5 | 66 1/2 | 169 |
| XL | 39 3/8 | 100 | 34 1/4 | 87 | 22 1/4 | 56.5 | 68 1/2 | 174 |
| XXL | 41 1/2 | 105.5 | 36 1/4 | 92 | 23 1/4 | 59 | 68 7/8 | 175 |
| 3XL | 43 3/4 | 111 | 38 1/4 | 97 | 23 5/8 | 60 | 70 1/2 | 179 |
| 4XL | 45 7/8 | 116.5 | 40 1/8 | 102 | 24 3/8 | 62 | 70 7/8 | 180 |
| 5XL | 48 | 122 | 42 1/8 | 107 | 24 3/4 | 63 | 72 1/2 | 184 |
| 6XL | 50 1/4 | 127.5 | 44 1/8 | 112 | 25 5/8 | 65 | 72 7/8 | 185 |

| Size | A| Chest | B| Waist | C| Hip | D| Inseam | E| Height | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| EU | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters |
| 44 | 33 7/8 | 86 | 28 3/8 | 72 | 34 1/4 | 87 | 29 1/2 | 75 | 65 | 165 |
| 46 | 35 3/8 | 90 | 29 7/8 | 76 | 35 7/8 | 91 | 29 7/8 | 76 | 66 1/8 | 168 |
| 48 | 35 3/8 | 90 | 29 7/8 | 76 | 35 7/8 | 91 | 30 1/4 | 77 | 66 1/2 | 169 |
| 50 | 37 | 94 | 31 1/2 | 80 | 37 1/2 | 95 | 30 3/4 | 78 | 67 3/4 | 172 |
| 52 | 37 | 94 | 31 1/2 | 80 | 37 1/2 | 95 | 31 | 79 | 68 1/8 | 173 |
| 54 | 38 5/8 | 98 | 33 1/8 | 84 | 39 | 99 | 31 1/2 | 80 | 69 3/4 | 176 |
| 56 | 38 5/8 | 98 | 33 1/8 | 84 | 39 | 99 | 31 7/8 | 81 | 69 3/4 | 177 |
| 58 | 40 1/8 | 102 | 34 5/8 | 88 | 40 1/2 | 103 | 32 1/4 | 82 | 70 7/8 | 180 |
| 60 | 40 1/8 | 102 | 34 5/8 | 88 | 40 1/2 | 103 | 32 5/8 | 83 | 71 1/4 | 181 |
| 62 | 41 3/4 | 106 | 36 1/4 | 92 | 42 1/8 | 107 | 33 1/8 | 84 | 72 1/8 | 184 |
| 64 | 41 3/4 | 106 | 36 1/4 | 92 | 42 1/8 | 107 | 33 1/2 | 85 | 72 7/8 | 185 |
| 66 | 43 1/4 | 110 | 37 3/4 | 96 | 43 3/4 | 111 | 33 7/8 | 86 | 72 7/8 | 188 |
| 68 | 43 1/4 | 110 | 37 3/4 | 96 | 43 3/4 | 111 | 33 7/8 | 86 | 74 | 188 |

| Measurement | Letter Sizing | Numeric Sizing |
|---|---|---|
| 2 1/8" - 2 5/8" | XS | 7 |
| 2 5/8" - 3 1/8" | SM | 8 |
| 3 1/8" - 3 5/8" | MD | 9 |
| 3 5/8" - 4 1/8" | LG | 10 |
| 4 1/8" - 4 5/8" | XL | 11 |
| 4 5/8" - 5 1/8" | XXL | 12 |
| 5 1/8" - 5 5/8" | XXXL | 13 |

| US | 6 | 7 | 8 | 9 | 10 |
| EU | 37 | 38 | 39 | 41 | 42 |
| US | 6 | 7 | 8 | 9 | 10 |
| EU | 37 | 38 | 39 | 41 | 42 |
| Size | A| Chest | B| Bust | C| Waist | D| Hip | G| Outer Arm | H| Height | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| US | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters | Inches | Centimeters |
| XS | 29 1/8 | 74 | 30 3/4 | 78 | 22 7/8 | 58 | 32 1/4 | 82 | 19 3/4 | 50 | 61 3/4 | 157 |
| S | 31 1/2 | 80 | 33 1/8 | 84 | 25 1/4 | 64 | 34 5/8 | 88 | 20 5/8 | 52.5 | 64 | 162.5 |
| M | 33 7/8 | 86 | 35 3/8 | 90 | 27 1/2 | 70 | 37 | 94 | 21 5/8 | 55 | 66 1/8 | 168 |
| L | 35 3/8 | 90 | 37 | 94 | 29 1/8 | 74 | 38 5/8 | 98 | 22 5/8 | 57.5 | 67 3/4 | 172 |
| XL | 37 1/4 | 94.5 | 38 3/4 | 98.5 | 30 7/8 | 78.5 | 40 3/8 | 102.5 | 23 3/8 | 59.5 | 69 1/2 | 176.5 |
| XXL | 39 | 99 | 40 1/2 | 103 | 32 5/8 | 83 | 42 1/8 | 107 | 24 1/4 | 61.5 | 71 | 180.5 |
| 3XL | 39 | 99 | 40 1/2 | 103 | 32 5/8 | 83 | 42 1/8 | 107 | 24 1/4 | 61.5 | 71 | 180.5 |
| 4XL | 41 | 104 | 42 1/2 | 108 | 34 5/8 | 88 | 44 1/8 | 112 | 25 1/4 | 64 | 72 7/8 | 185 |
| 5XL | 43 | 109 | 44 1/2 | 113 | 36 5/8 | 93 | 46 | 117 | 25 7/8 | 65.5 | 74 | 188 |

| Size | 38 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | 54 |
|---|---|---|---|---|---|---|---|---|---|
| A. Chest (cm) | 78 | 82 | 82 | 86 | 86 | 90 | 90 | 94 | 94 |
| B. Bust (cm) | 82 | 86 | 86 | 90 | 90 | 94 | 94 | 98 | 98 |
| C. Waist (cm) | 62 | 66 | 66 | 70 | 70 | 74 | 74 | 78 | 78 |
| D. Hip (cm) | 86 | 90 | 90 | 94 | 94 | 98 | 98 | 102 | 102 |
| F. Inner Leg (cm) | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 |
| G. Outer Arm (cm) | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 |
| H. Height (cm) | 161 | 164 | 165 | 168 | 169 | 172 | 173 | 176 | 177 |
| A. Chest (in) | 30 3/4 | 32 1/4 | 32 1/4 | 33 7/8 | 33 7/8 | 35 3/8 | 35 3/8 | 37 | 37 |
| B. Bust (in) | 32 1/4 | 33 7/8 | 33 7/8 | 35 3/8 | 35 3/8 | 37 | 37 | 38 5/8 | 38 5/8 |
| C. Waist (in) | 24 3/8 | 26 | 26 | 27 1/2 | 27 1/2 | 29 1/8 | 29 1/8 | 30 3/4 | 30 3/4 |
| D. Hip (in) | 33 7/8 | 35 3/8 | 35 3/8 | 37 | 37 | 38 5/8 | 38 5/8 | 40 1/8 | 40 1/8 |
| F. Inner Leg (in) | 29 1/8 | 29 1/2 | 29 7/8 | 30 1/4 | 30 3/4 | 31 1/8 | 31 1/8 | 31 7/8 | 31 7/8 |
| G. Outer Arm (in) | 20 1/2 | 20 7/8 | 21 1/4 | 21 5/8 | 22 | 22 1/2 | 22 7/8 | 23 1/4 | 23 5/8 |
| H. Height (in) | 63 3/8 | 64 5/8 | 65 | 66 1/8 | 66 1/2 | 67 3/4 | 68 1/8 | 69 1/4 | 69 5/8 |
* Sizing information is provided by the manufacturer and does not guarantee a perfect fit.