Loose materials (VLR) help children have an open educational environment for children to freely express their ability to learn and play creatively according to their preferences and without limits. When learning and playing with VLRs, children connect them together from simple to complex, thereby gradually improving their knowledge and skills. VLRs come in a variety of sizes, colors, materials, shapes... From there, children will have interesting and practical experiences with everyday life. They are also one of the materials that can be taken from environment, very easy to find, especially in places with a lot of nature like the highlands. Taking advantage of VLRs from the outside environment will reduce the budget load on learning materials as well as help preschools create a close, friendly learning environment suitable to local culture and actual conditions to meet the needs of the environment. The criterion “Building green - safe - friendly kindergartens” is suitable for education in the current era.