Aircell is an extremely lightweight and breathable fabric made entirely from recycled polyester. The double-layer knitting technique used for this fabric allows us not to use a lining. This is due to its strong structure despite being so permeable to air. It offers perfect comfort and flexibility allowing it to be used in the extra-light styles of our collection.Specifications:- Upper: Aircell (75% recycled polyester and 25% polyester)- Panels: Suede and leather- Logo V: Amazonian rubber (26%), mineral silica (22%), synthetic rubber (14%) and others (38%)- Insole: Amazonian rubber (10%), bio-based E.V.A.* (41% sugar cane), recycled E.V.A.* (10%), organic cotton (16%) and others (13%)- Midsole: Bio-based E.V.A.* (52% sugar cane) and others (35%)- Outsole: Amazonian rubber (12%), mineral silica (30%), synthetic rubber (49%) and others (9%)- Lining: Tech (100% recycled polyester)- Laces: Organic cotton (100%)