Merebe 3D air mesh mats are made with high quality 3 dimensional material originally created in Germany. The mats can be used throughout all 4 seasons- cool in summer, warm in winter. They are especially a must buy product for babies who sweat at night or when they sleep, as the mesh mats allow easy ventilation unlike ordinary mats. The special mesh type material allows excellent air circulation, anti-slip feature added, easy to wash and prevents baby suffocation and germs to form. Made with only the 3D material, no adhesive is used, so they are free from harmful chemical substances. Merebe produces air mats with its own special designs which include cute babyish food and animal characters. The 3D air mesh mats by Merebe are thicker than standard mats and excellent against compression, making them highly durable.