The Slalom RB-3 Classic racing boots have FIA 8856-2000 and SFI 3.3/5 type approval. They are amply customizable in line with the Sparco guidelines. The uppers on Slalom RB-3 Classic boots are made from very high quality calf skin which has been softened and given an "aged" look. The insoles are made from pure leather and the soles are in natural rubber.