The short power strap for Backland boots fits the backland models with the size 22.0-24.5.
Inside Atomic boots
With your arms in a slightly bent position, measure from the centre of the back of your neck, along the length of your arm, to the wrist.
Measure around your chest, holding the measuring tape under your armpit.
Measure around your waist at the narrowest part.
Measure around your hips at the widest part.
From a standing position, measure your inner leg to the sole of your foot.