Year Released: 1982

Think Nike Frees were the first running shoes to incorporate slashes in the midsole foam? Think again. ASICS developed the X-Caliber in 1982, and while the cuts didn't break the outsole (and the ones in the heel were more for cushioning than flex), the beauty was still there. Also worth noting is without ASICS predecessor Onitsuka Tiger there might be no Nike at all.