La M1
| Hook | Dry type, 10 to 18 |
| Thread | Black |
| Body | Goose feather fibers dyed in yellow |
| Tails | Red cock hackle fibers |
| Wings | Dark CDC fibers, extending well toward the bend. |
| Hackle | Short red cock hackle |
| Creator | Marcel Langhendries |
| Use | Caddis or mayfly imitation, perfect when you don't know what is hatching. |