Fractal Umbra is a  handmade "skeleton" or inline skate binding with the following features:

Plate sizes matching each wrap/eclipse liner size.
Soul widths : 45mm outside, 40mm inside
UHMW soul, lower friction
UHMW cuffs. UHMW is not breakable in ambient temperatures and white uhmw doesn't get yellow over time
Reduced soulplate friction area for even faster grinds
Lighter materials and construction
Lower ride height : 8mm from top of the plate to top of your frame instead of 11.5mm (without shock absorbers)
Wider straps - more velcro
Deep V-cut cuff - enhanced backward flex, more precise control, enhanced range of movement while maintaining good sideways support
Increased sideways support, different flex characteristics with the shape, thickness and material of the plates.
Toe/heel rough/tough grind space - generous room for rough and tough grinds
Reduced heel slip
EVA shock absorbers - 50% ligher and much more responsive
Highest quality name brand Velcro hook and loop and literal car seat belts used for all straps
Custom selection for your own groove or no groove at all if you want to create your own.
Optional custom leather covered straps and instep bindings.
Instep bindings with 1cm thick foam.

Here are a few tips and ideas:

Always know which one is which:

 

The 3 triangles in each other is one of the Fractal emblems, it normally appears on the left side, left foot, think about the 3 triangles as "Fractal",


The Umbra logo is a stylized depiction of an eclipse, it normally appear on the right side of products, right foot .

By remembering these two emblems you always know that left foot is the Fractal (triangles) and right foot side is always Umbra. (engraved on cuffs and inside the plates as well).



Even more ways to adjust your flex :
You can not only move the cuffs backward and forward to accommodate your footwear's size precisely, but you can move each side individually:
By having one side more forward, you increase sideways flex on that side and vice versa.

"Umbra is the darkest part of a shadow or a completely dark central portion of the shadow cast during an eclipse."