The SV5 shields fit both C4 and C4 Pro, however, the shell size break is different between the two models. You will want to select the face shield based on the size and model of your helmet.
| Shield Size | C4 Helmet Size | C4 Pro Helmet Size |
|---|---|---|
| Small | XS-SM | XS-LG |
| Large | MD-2XL | XL-3XL |