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Why run when you can fly? Designed for record breakers in the making, the Nike Sonic Fly (Grade School) pairs a lightweight design with soft, springy foam that helps add energy to every stride.
Responsive Cushioning
We packed the midsole with soft and springy foam that absorbs impact and adds energy to every stride you take.
Lightweight But Durable
Less weight means more speed. Mesh throughout the upper helps keep these shoes lightweight and breathable. We reinforced the toe and sides for added durability.
Support You Can Feel
Bands at the side of your feet work with the laces to add stability and a secure feel.
Traction That Keeps Up
Rubber outsole with Waffle-inspired tread pattern helps provide durable traction.
More Details
| US | EUR | UK | JPN (cm) |
|---|---|---|---|
| 7.5 | 40.5 | 6.5 | 25.5 |
| 8 | 41 | 7 | 26 |
| 8.5 | 42 | 7.5 | 26.5 |
| 9 | 42.5 | 8 | 27 |
| 9.5 | 43 | 8.5 | 27.5 |
| 10 | 44 | 9 | 28 |
| 10.5 | 44.5 | 9.5 | 28.5 |
| 11 | 45 | 10 | 29 |
| 11.5 | 45.5 | 10.5 | 29.5 |
| 12 | 46 | 11 | 30 |
| 13 | 47.5 | 12 | 31 |
| 14 | 48.5 | 13 | 32 |
| 15 | 49.5 | 14 | 33 |
| CM | US |
| 13.3 cm | 6C |
| 14.2 cm | 7C |
| 15 cm | 8C |
| 15.9 cm | 9C |
| 16.7 cm | 10C |
| 17.6 cm | 11C |
| 18.4 cm | 12C |
| 19.3 cm | 13C |
| 20.1 cm | 1Y |
| 20.8 cm | 2Y |
| 21.6 | 3y |
| US | EUR | UK | JPN (cm) |
| 5 | 35.5 | 2.5 | 22 |
| 5.5 | 36 | 3 | 22.5 |
| 6 | 36.5 | 3.5 | 23 |
| 6.5 | 37.5 | 4 | 23.5 |
| 7 | 38 | 4.5 | 24 |
| 7.5 | 38.5 | 5 | 24.5 |
| 8 | 39 | 5.5 | 25 |
| 8.5 | 40 | 6 | 25.5 |
| 9 | 40.5 | 6.5 | 26 |
| 9.5 | 41 | 7 | 26.5 |
| 10 | 42 | 7.5 | 27 |
| Size | CHEST (cm) | WAIST (cm) | HIP (cm) | Height (cm) |
|---|---|---|---|---|
| XS | 80 β 88β³ | 65 β 73β³ | 80 β 88β³ | 170 β 183 |
| S | 88 β 96β³ | 73 β 81β³ | 88 β 96β³ | 170 β 183 |
| M | 37 β 40β³ | 81 - 89β³ | 96 - 104β³ | 170 β 183 |
| L | 40 β 44β³ | 89 - 97β³ | 104 - 112β³ | 170 β 183 |
| XL | 44 β 48β³ | 97 - 109β³ | 112 - 120β³ | 170 β 183 |
| 2XL | 48 β 52β³ | 109 - 121β³ | 120 - 128β³ | 170 β 183 |
| Size | BUST | WAIST | HIP |
|---|---|---|---|
| XXS | 70 - 76β³ | 54 - 60β³ | 78 - 84β³ |
| XS | 76 - 83β³ | 60 - 67β³ | 84 - 91β³ |
| S | 83 - 90β³ | 67 - 74β³ | 91 -98β³ |
| M | 90 - 97β³ | 74 β 81β³ | 98 β 105β³ |
| L | 97 β 104β³ | 81 β 88β³ | 105 β 112β³ |
| XL | 104 β 114β³ | 88 β 98β³ | 112 β 120β³ |
| 2XL | 114 β 124β³ | 98 β 108β³ | 120 β 128β³ |
| Size | Numeric Size | Age | Height (cm) | Chest (cm) | Waist (cm) | Hip (cm) |
|---|---|---|---|---|---|---|
| XS | 6 - 7 | 7 - 8 | 122 - 128 | 64.5 - 66 | 59.5 - 61.5 | 68.5 - 71 |
| S | 8 - 9 | 8 - 10 | 128 - 137 | 66 - 69 | 61.5 - 65 | 71 - 74.5 |
| M | 10 - 12 | 10 - 12 | 137 - 147 | 69 - 75 | 65 - 69 | 74.5 - 79.5 |
| L | 14 - 16 | 12 - 13 | 147 - 158 | 75 - 81.5 | 69 - 72.5 | 79.5 - 84.5 |
| XL | 18 - 20 | 13 - 15 | 158 - 170 | 81.5 - 88.5 | 72.5 - 75.5 | 84.5 - 89.5 |
| XS | < 29 | < 35 | 32 | 34 | 30 |
|---|---|---|---|---|---|
| S | 29β32 | 35β37.5 | 32.25 | 34.25 | 30.25 |
| M | 32β35 | 37.5β41 | 32.5 | 34.5 | 30.5 |
| L | 35β38 | 41β44 | 32.75 | 34.75 | 30.75 |
| XL | 38β43 | 44β47 | 33 | 35 | 31 |
| XXL | 43β47.5 | 47β50.5 | 33.25 | 35.25 | 31.25 |
| XXXL | 47.5β52.5 | 50.5β53.5 | 33.5 | 35.5 | 31.5 |
| XS | 0β2 | 23.5β26 | 33β35.5 | 31.2 | 33.25 | 29.25 |
|---|---|---|---|---|---|---|
| S | 4β6 | 26β29 | 35.5β38.5 | 31.2 | 33.25 | 29.25 |
| M | 8β10 | 29β31.5 | 38.5β41 | 31.5 | 33.5 | 29.5 |
| L | 12β14 | 31.5β34.5 | 41β44 | 31.5 | 33.5 | 29.5 |
| XL | 16β18 | 34.5β38.5 | 44β47 | 31.75 | 33.75 | 29.75 |
| XXL | 20β22 | 38.5β42.5 | 47β50 | 31.75 | 33.75 | 29.75 |
| SIZE | 30 | 32 | 34 | 36 | 38 |
| A | XS | XS | S | M | L |
| B | |||||
| C | S | ||||
| D | M | L | XL | ||
| DD | |||||
| E |

