La Sportiva SYTRON Owner's Manual page 8

4. SPIDER BUCKLE EVO
Closure system that allows for the perfect distribution of tension on all the surface of
the tongue with one quick move.
The lever has 2 different regulations for uphill [A] and downhill mode [B].
Micro-regulation of the cable tension:
8
A
To remove the boot, open
B
the levers and unhook the
cable from the black loop
indicated by the arrow.