Diving material is a type of synthetic rubber foam with fine, soft, and elastic properties. It offers shock resistance, thermal insulation, impermeability, and airtight performance. This lens bag is made from high-quality neoprene, providing greater portability than rigid lens barrels and saving space in suitcases or bags. A built-in loop allows the bag to be attached to belts or other gear, making it convenient for carrying and quick lens changes. 4-in-1 protection: Waterproof, shockproof, cold-resistant, and dirt-resistant lens pouch. This model is a universal lens bag compatible with lenses of various brands as long as the size matches. Note that accessories such as lens hoods and filters may not fit. Belt Loop: Enables easy carrying. Hook-and-loop closure: Allows attachment to any item with a loop or ring, such as camera bags or backpacks. Available in 4 sizes: S, M, L, and XL, suitable for most standard camera lenses. Size Details: Small (S): 8cm diameter, 10cm length. Maximum lens length: 7cm; maximum diameter: 8cm. Medium (M): 9.5cm diameter, 14cm length. Maximum lens length: 11cm; maximum diameter: 9cm. Large (L): 10cm diameter, 18cm length. Maximum lens length: 15cm; maximum diameter: 10cm. Extra Large (XL): 10cm diameter, 24cm length. Maximum lens length: 22cm; maximum diameter: 10cm. Color: Black Material: Neoprene Package Contents: 1 x Small lens bag 1 x Medium lens bag 1 x Large lens bag 1 x Extra Large lens bag Note: The package includes only the items listed above. Other accessories are not included. Lighting and monitor differences may cause slight variations in color between the image and the actual item. Measurement error allowance: +/- 1-3cm.