The 243 extruded aluminum frame provides torsional rigidity and advanced maneuverability

Most importantly

Spitfire ALU

Freeskating

this piece attaches the upper cuff to the lower shell

UNION Forma Elite Ankle Strap Kit - Black Size:S The 243 extruded aluminum frameForma Elite Ankle Strap Rapid response on the outside, fit and pillowed comfort on the inside. The Union Forma Elite ankle strap is lightweight, durable and fits well with any make and model of boot on the market today. Includes: Left and Right Ankle StrapAluminum Ratchets x 2Ratchet Screw x 2Mini Ankle Connector x 2Tool less Adjuster x 2Compatibility: All Union Bindings (2016 Present) Stiffness: 5 10 Unions Most Comfortable and Flexible Ankle Strap