These weighted blankets are filled with silicone beads. Silicone beads are very dense so our blankets are 40% thinner than those filled with plastic polypellets.There are 8 edge loops for connecting to a cover.Weighted blankets are a form of deep pressure therapy and can be very beneficial to children with sensory challenges! Did you know that they are also good for:1. Managing Sensory Processing Disorders, Autism, and ADHD2. Reducing stress and anxiety3. Improving concentration4. Boosting serotonin (the happy hormone)5. Helping to relieve insomnia and improving quality of sleep