Zoot Women's Ultra Kapilani Running Shoe 100% Mesh and synthetic Rubber sole Air Mesh Upper - Allows air to permeate the exterior, providing breathability. BareFit - encompasses the entire upper and is constructed to allow for sockless wear. Dri-lex lining - With antimicrobial Smart Silver to battle moisture, odor and to reduce hot spots. Asymmetrical, perforated neoprene tongue panel - Ensures excellent fit, breathability and quick-entry. Single Layer Ultra Sockliner - Is designed for barefoot running comfort.