This is the leather upper, which featured a partial K Leather upper near the toe are of the boots, and a newly designed "X Skin" upper for the back 3/4 of the boots, the same upper as on the synthetic mode
This new upper featured dozens of tiny little grooves or dots that provided some texture throughout the upper and helped with the grip
The leather did not feature the "Techfit" sock liner technology, like the synthetic variation did
The Sole Plate:
A one piece hard plastic material was used, with half a dozen grooves throughout the boot to make the sole plate a bit more flexible
A triangular 3-D stud design was used, very similar to the Vapor XI model
There were also several smaller studs used to help with traction near the mid foot area
This is the SG Variant that also featured 6 aluminum studs mixed with the plastic triangular studs
Overall, the soleplate was lightweight, but still a bit stiff
Notes and Comments:
The X15.1 was the newly renovated F50 model and had some similar features
It was interesting to see the K Leather being used on the upper, the previous F50s used a calf skin material that was a bit lighter, but definitely not as high quality as K Leather
Overall the upper had a great new technology that helped with the grip, while still staying lightweight
Check out our shipping page for all of your shipping answers!