The bag and back have approximately 0.4 inch (1 cm) thick cushioning, which helps protect your precious keyboard from impact and vibration. Protects delicate instruments. In addition, the thickness of this cushion protects against water such as rain. Made with durable material with excellent water repellent properties, it can be used for transportation and transportation during rainy days, outdoor events, and road lives. Although it has excellent water repellency, please note that it is not waterproof.It is also recommended to use waterproof sprayers.