IMEVA midsole; Dual-density Collar uses both a softer density foam against the foot for cushioning, and a firmer density foam for support
EVA (Ethyl Vinyl Acetate) foam footbed for cushioning
IMEVA (injection-molded EVA foam) midsole for firm yet flexible cushioning
Internal shank
Designed for superior all day comfort, 608v4 comfort pack features a NB memory sole comfort insert, cush NB midsole and performance stretch laces to help provide 360 degrees of comfort