Reebok Z Belle running shoes are constructed with a women's-specific upper made with modern materials for support and style. You'll feel support at any speed with ZStrike-inspired pistons. Updated graphics give the shoes feminine flair.Upper: NanoStretch technology provides a lightweight, locked-in fit and stability. Mesh offers breathable flexibility. Flat laces reduce irritation.Midsole: IMEVA foam offers superior lightweight shock absorption. 5mm EVA sockliner provides excellent underfoot feel. Outsole: Single-density ZStrike pistons provide stride cushion at any speed. Targeted CRTek high abrasion rubber on the outsole provides durable traction.