Nike named the shoes the Zoom Matumbo after Bernard Lagat, a US elite distance runner, said that the hole in the back of the spikes reminded him of a Matumbo, which in his native African language means the best part of the goat.
Nike's Product description:
The Zoom Matumbo is the lightest distance spike Nike has ever made for the very best distance runners in the world. High strength Flywire technology works to minimize overlays and maximizes strength and durability of the spike. Lightweight Flashion midsole foam provides great arch support and protection over any distance. Horseshoe Pebax® plate with four removeable pins. Sharkskin heel pad delivers added traction and reduce weight. Wt. 3.4 oz.