The Synchron made its first appearance in 1980, introducing a unique lacing system in the toebox that set this shoe apart from other footwear. The innovative design aimed to provide a better fitting upper for added comfort and durability. The Synchron Classic 90s edition features an air cushion unit and a stable heel cap to ensure a supportive and comfortable experience with every step.
| FOOT & SHOE SIZE (MM) | US MEN’S SIZE | US WOMEN’S SIZE | UK SIZE | EU SIZE |
|---|---|---|---|---|
| Foot: 221 mm Shoe: 230 mm |
4 | 5.5 | 3 | 35 |
| Foot: 225 mm Shoe: 234 mm |
4.5 | 6 | 3.5 | 36 |
| Foot: 229 mm Shoe: 238 mm |
5 | 6.5 | 4 | 37 |
| Foot: 233 mm Shoe: 243 mm |
5.5 | 7 | 4.5 | 38 |
| Foot: 237 mm Shoe: 246 mm |
6 | 7.5 | 5 | 39 |
| Foot: 241 mm Shoe: 251 mm |
6.5 | 8 | 5.5 | 39.5 |
| Foot: 245 mm Shoe: 255 mm |
7 | 8.5 | 6 | 40 |
| Foot: 249 mm Shoe: 259 mm |
7.5 | 9 | 6.5 | 40.5 |
| Foot: 253 mm Shoe: 263 mm |
8 | 9.5 | 7 | 41.5 |
| Foot: 258 mm Shoe: 268 mm |
8.5 | 10 | 7.5 | 42 |
| Foot: 263 mm Shoe: 272 mm |
9 | 10.5 | 8 | 42.5 |
| Foot: 267 mm Shoe: 276 mm |
9.5 | 11 | 8.5 | 43.5 |
| Foot: 271 mm Shoe: 280 mm |
10 | 11.5 | 9 | 44 |
| Foot: 275 mm Shoe: 285 mm |
10.5 | 12 | 9.5 | 44.5 |
| Foot: 279 mm Shoe: 289 mm |
11 | 12.5 | 10 | 45 |
| Foot: 283 mm Shoe: 293 mm |
11.5 | 13 | 10.5 | 46 |
| Foot: 287 mm Shoe: 297 mm |
12 | 11 | 46.5 | |
| Foot: 291 mm Shoe: 301 mm |
12.5 | 11.5 | 47 | |
| Foot: 295 mm Shoe: 306 mm |
13 | 12 | 48 | |
| Foot: 304 mm Shoe: 310 mm |
14 | 13 | 49 |
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