Reliable MIZUNO quality upper
The upper features both laces and a strap, typical of jumping spikes, made from synthetic fibers (mesh part) and artificial leather (enamel part). Feature ① The thinness of the tongue (the part covering the instep in the center of the upper) and the shoelaces Feature ② Reinforcement tape attached to the mesh fabric at the top of the toe The tongue and laces are overwhelmingly thinner compared to other companies' long jump spikes, similar in thinness to Mizuno's representative model, Chrono Inks. This thinness allows the foot and laces to be tied as closely as possible, creating a sense of unity between the foot and shoe. This prevents shoe slippage and provides a high level of fit. Additionally, this sense of unity makes the spikes feel lighter than their actual weight. The reinforcement tape reduces lateral sway during takeoff and minimizes power loss.
Wide design that fits Japanese feet
Since these spikes seem to be made by a Japanese manufacturer for Japanese people, they are relatively wider. They are not wider than the Adizero LJ, but compared to Asics' Long Jump Pro and NIKE's Zoom LJ4, they have a more spacious toe box. Regarding the heel, it gives a solid impression. Perhaps due to the use of mesh fabric on the toe side, the heel, made solely of artificial leather, feels robust. Furthermore, not only in contrast to the mesh fabric, but this heel is made the hardest among the entire upper of the spikes. This heel section is sewn with multiple layers of artificial leather.
Sole that creates a reassuring sense of stability
It has a typical field spike structure with sharkskin in the forefoot and heel. However, the Field Geo LJ-B has a support pillar embedded within the sole that connects the front and back, functioning like a single-piece sole. This pillar is sturdy enough that its shape becomes visible in the sole after long-term use. Additionally, the Field Geo LJ-B features claws at both ends of the toe that are not found on other companies' long jump spikes, allowing them to grip the ground firmly and transmit power right up to the takeoff point. There are nine pins, the same number as ASICS' Long Jump Pro (1-3-5 configuration), but the stability is higher in the Field Geo LJ-B due to the pin configuration being 2-3-4.
Flat sole that is easy to take off
The curvature of the sole is made relatively flat to a standard degree. Compared to the Long Jump Pro, which serves the same purpose, it can be said to be considerably flatter. Furthermore, it is flatter than the Adizero LJ and is among the flattest long jump spikes sold in general stores (Company S and Company B) in Japan. However, this flat sole does not give the impression of being difficult to run in, and there is not much resistance to increasing speed during the approach. (However, the ease of approach does fall short compared to the Long Jump Pro / ASICS.)
