There are three main types of fillings to choose from when making a weighted blanket. These three types comprise of poly pellets, glass beads and sand. Glass beads are the most popular because they are smaller and less bulky. U.S. Solids Glass Beads are extremely tiny and have a similar look and feel to white beach sand or salt crystals. They look much smoother inside of a blanket than the other two types of filler. This makes them the best option for people with any type of auditory, sensory and physical sensitivities. Glass beads are also heavier than poly pellets, allowing you to accomplish the same weight with less pellets. U.S. Solids Glass Beads are great for someone who wants weight but not an extreme amount of bulk on top of them.