The Fierce 6 specification gives two measurements that can easily be read as if they describe the same thing: a 5mm moulded insole and a 6mm heel-to-toe drop. They refer to different parts of the shoe. Reading them separately makes the Fierce 6 men’s model, 672612202, easier to compare with another trainer.
Start with the two midsole components
On its BPM product page, 361° describes CQT QU!K as the upper midsole layer and zoned EVA as the base. It also identifies reinforced EVA on the medial side. These are the manufacturer’s descriptions of the structure beneath the upper.
A shared foam name is only one part of a specification. It does not tell us the hardness of each layer, their individual thicknesses, or how much either layer will compress for a particular runner. The cited page does not publish those measurements, so assigning a precise firmness or energy-return percentage would go beyond the evidence.
The 5mm figure belongs to the insole
The Frosty specification separately lists a 5mm moulded insole. This is a component above the midsole platform, rather than the full height of the shoe beneath the heel. The page does not provide a complete dimensioned cross-section that would let us reconstruct the whole sole from its individual parts.
For that reason, we do not add the insole figure to an assumed midsole height or present it as a measured total stack. A comparison based on those invented totals would appear precise while relying on missing information.
The 6mm figure is a heel-to-toe difference
The manufacturer states a 6mm drop. Drop describes the difference between the rear and forefoot heights, rather than either height on its own. It therefore cannot supply the missing heel or forefoot stack measurement. Nor can it tell a shopper how the shoe will feel underfoot without considering the rest of the construction and fit.
Keep three separate notes when comparing specifications: the named foam components, any published component dimensions, and the stated drop. If a second model reports only heel stack, that number is answering a different question.
Use the rest of the shoe as context
Fierce 6’s published details also include a jacquard upper and segmented outsole with reinforcement at forefoot and heel wear zones. The product gallery provides matching side, pair, rear and outsole views. They help locate these parts, but they are catalogue photographs rather than a wear-test or a scale drawing.
For a second model to research, the BOUNDAI 6 listing and its construction guide document a different manufacturer’s description. Compare what each source actually discloses, and check the model-specific size references before ordering.
Manufacturer sources checked 3 November 2026. This article analyses published construction details; RunningArea has not performed an on-foot test of this model.