The carbon base is just like other SL boots; recognized as the best. 
The cuff is softer & flexible
The rockerable Freestyle frames are the symbol of the Freestyle slalom’s new school. 
The main advantages of this setup are the combination of wheels to optimize performance while keeping the Standard Freestyle dimensions. Depending on the athlete’s size, the frames come in 3 sizes, all 3 with the rockerable option:
219mm (80/68/68/80) from size 34 to 37
231mm (84/72/72/80) from size 38 to 42
243mm (90/72/72/90) from size 43 to 47
The frame is mounted with Bigger & Softer wheels (82A) on the outside for best grip & stability; and Smaller & Harder wheel (84A) in the inside for increased maneuverability.

• REF: FRSKB-SL7-BK
• SIZE: 34-47
• COLOR: Black
  
• FRAMES: FR - FREESTYLE FRAMES - BLACK - 219mm ( 80/68 ) from size 34 to 37, 231mm ( 84/72 ) from size 38 to 42, 243mm ( 90/72 ) from size 43 to 47
• WHEELS: FR Street Invaders
• BEARINGS: MW9 BEARINGS
• SHELL: Carbon Fiber
• LINERS: Integrated
• INSOLES: Premium
• CUFFS: Plastic
• USE: Freestyle, Freeride

The SL Seven stands out from the other FReestyle oriented models with a less rigid cuff for riders looking for more freedom on the ankle movements, making it a more versatile tool for any type of skating
SL SEVEN features the same base as the SL skates, Carbon Shell, 2 buckles, premium insoles, a Plastic cuff, and a nice updated color way.