The Ago protected fits inside the MEN to add additional protection in the region of the ago to protect against the impact of Tsuki.
Take the MEN measurement B and use the reference table below to select the matching size.
| Measurement B (cm) | Size |
| Greater than 74 cm & 14 Mengane | L |
| Between 64 cm ~ 74 cm & 13 ~ 14 Mengane | M |
| Between 63 cm ~ 58 cm & 12 ~ 13 Mengane | S |
NOTE: If B is less than 63cm then you should not be practicing Tsuki on this individual.