A complete innovation for the climbing stars of the future. The new last has been adapted to the special ergonomic and anatomic needs of growing feet: the heel is narrow and straight so as not to irritate the Achilles' heel, plus the toe box is specially shaped to avoid excessively compressing the toes. The PUZZLE is very soft and flexible, thereby promoting young people's natural stepping behavior of "grabbing" footholds with the feet. This "claw effect" is supported by a slightly deeper last in the toe area. As the PUZZLE also has a relatively aggressive design with a strong downturn, it still offers superb performance and is particularly ideal for advanced climbers. The upper is made from a single piece, which not only improves comfort by minimizing stitching but also eliminates excess material. The tongue is made from breathable knitted fabric comprising recycled yarn.