The Bounce Zero is lined with linen on the inside, which keeps the foot cooler and drier than synthetic linings. The insole pad is removable, so you can swap in your own orthotics or replace it when it wears down.MATERIALS & CONSTRUCTION Upper: Mesh knit fabric that allows air to pass through the sides, top, and tongue of the shoe. Outsole: High-quality EVA outsole for traction and long-lasting durability. Insole: Removable EVA (ethylene-vinyl acetate) insole pad with built-in arch support. Lining: Soft linen interior for moisture-wicking comfort against the skin. Closure: Lace-up with 6 eyelets for a snug, adjustable fit. Style: Low-top sneaker silhouette. Unisex fit. Weight: 486g (smallest) to 802g (largest) PRINT QUALITY The print bonds directly into the material rather than sitting on top. It won't crack, peel, or fade with normal wear. High-resolution printing across every customizable surface of the shoe. Full color with no limit on the number of colors in your design.