You plus the Rykä Equation equals a run you won't forget. Lace up! ; A lightweight running shoe built on a neutral last. Breathable mesh upper. Lightweight synthetic overlays. Lace-up style. Padded tongue and collar for added comfort. Soft fabric lining feels great against the skin. Ortholite insole supplies light underfoot cushioning. Lightweight molded 3-D EVA midsole provides lasting plush. Strategically placed rubber on the outsole for reliable traction. Alternating flex grooves for enhanced flexibility. Measurements: ; Weight: 9 oz ; Product measurements were taken using size 9, width B - Medium. Please note that measurements may vary by size.