You can extend the strap by about 5-10cm by skipping the first two slits and threading through the third, or by skipping the first four slits and threading through the fifth.
Adjusting the M size will result in the following:
・Skipping the first two slits and threading through the third will be equivalent to the shortest setting of the L size.
・Skipping the first four slits and threading through the fifth will be equivalent to the shortest setting of the 2L size.
