Foot Support and Comfort Add comfort and support to your favorite footwear with The Felt Store's Cork Insoles. Made with 100% real cork, these insoles provide insulation and moisture-regulation for healthier feet. These insoles are 2.5mm thick, durable and naturally odor-resistant, making them the ideal choice for any shoe. Size adjustments can be made to the insoles using a sharp knife and short, frequent strokes.