In our own experience, LT masks generally size as follows:
| Bridle size | LT mask size |
| Shetlands, small/fine-headed ponies | X-small |
| Most pony-size | Small |
| Most cob-size | Medium |
| Top-end cob & most full-size | Large |
| Top-end full, X-full size | X-large |
Click here for Fenwick's own detailed sizing guide which will give you more detailed information including key mask dimensions for each size. And here's a video Fenwick have produced as guidance