Details: Clarks Unstructured Un.Signal The Clarks Unstructured Un.Signal go-anywhere women's flat combines classic navy leather with distinctive suede accents. The UnstructuredÂ® Air Circulation System, a unique climate control technology, keeps feet feeling fresh and comfortable all day, while an OrthoLiteÂ® footbed and ultra-soft leather linings surround the foot in softness. Refined details make the Clarks Unstructured Un.Signal a shoe you can dress up or down. MaterialsLeather and suede upperOrtholite footbedNylon shankEVA midsoleRubber outsoleHeel Height1"Weight6 oz.LiningLeather and suedeCountry of OriginChinaItem #60903, 60904, 60905 Technical FeaturesThe Clarks Unstructured collection is lightweight, flexible, soft and breathable because it features the unique Air Circulation System â a climate control technology that keeps feet fresh and comfortable all day. Itâs like fresh air for feet. Strategically placed vents allow warm air to escape.Fresh air is pulled in through vents near the sole, creating a comfortable, dry climate with every step.Designed to offer impact responsive airflow, Active Air is a unique air-cushioning technology that buries a network of air channels and chambers deep within the midsole and footbed of the shoe.