Break records and break more records in the Saucony® Endorphin 2 track shoes! Predecessor: Endorphin. Support Type: Neutral. Cushioning: Lightweight, flexible response. Surface: Track. A versatile, featherlight track-and-field racing spike. FLEXFILM™ upper provides exoskeletal support with an ultralightweight, next-to-skin design. Lace-up closure. Thin comfort tongue and slightly padded heel cup. Soft textile lining supplies a great next-to-foot feel. Thin, removable insole.