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$25
compression molded eva vs injection molded eva
The upper, the midsole, the outsole, the fit and the price to name a few. They're very different.
Shay is a little lighter, fits nicer (especially around the forefoot), and is a tad more "aggressive", as the shoe is shaped to put you up on your toes a bit.
The Kilkenny also fits fairly snug, a little on the short side, and is very flexible in the midfoot. Kilkenny is one of the best selling XC spikes in the country, if not the best.