A weighted blanket is a specialized type of bedding that uses added mass to provide Deep Pressure Stimulation (DPS), a therapeutic technique intended to promote calmness and relaxation. This gentle, evenly distributed weight mimics the feeling of a comforting hug or swaddle, engaging the parasympathetic nervous system to help the body feel grounded and secure. The internal composition, distinct from standard bedding, allows the blanket to deliver consistent, heavy pressure across the user’s body.
The Primary Weighting Materials
The weight comes from thousands of tiny, free-flowing particles sealed inside the blanket’s layers. The two most common industrial fillers are glass microbeads and polypropylene plastic pellets, each offering a different feel and performance profile. Glass microbeads are the denser option, typically measuring about 1 millimeter in diameter. Their high density allows the blanket to achieve its target weight with less bulk, resulting in a thinner, more flexible product that drapes smoothly.
Glass beads are generally quieter, retain less heat, and are often used in “cooling” blankets, though they are typically more expensive. Alternatively, polypropylene plastic pellets (poly pellets) are larger, around 3 millimeters in diameter, and are lighter per volume. Plastic pellets are a more budget-friendly option, creating a fuller, more cushioned blanket. However, their larger size can lead to a slightly textured feel, a gentle rustling sound, and may contribute to a warmer sleeping experience due to lower thermal conductivity. Commercial manufacturers avoid natural fillers like rice or grain because they clump, attract pests, and cannot be easily washed.
Internal Construction and Weight Distribution
To ensure the weight is evenly applied and does not pool at the edges, weighted blankets rely on sophisticated internal construction. The filler is contained within a grid-like structure of small compartments created through baffling or quilting. This process involves stitching the inner fabric layers together to form small squares or channels. Smaller compartments are more effective at preventing the filler from shifting or clumping excessively. The durable inner fabric, often polyester or cotton, securely contains the beads, ensuring the therapeutic pressure is consistent across the body.
Outer Shell Fabrics and Removable Covers
The outermost layer of a weighted blanket is designed for comfort, temperature regulation, and easy cleaning. The permanent outer shell, which encases the weighted core, is made from various fabrics. Common materials include breathable cotton for cooling airflow, and minky or fleece fabrics for soft texture and extra warmth.
Many weighted blankets also come with a separate, removable cover for maintenance and temperature control. These covers are typically made from materials like bamboo or cooling knits for warm sleepers, or soft microfiber for those seeking coziness. The cover is secured to the weighted inner blanket using ties, loops, or zippers to prevent shifting. This feature is useful because the heavy inner blanket is often spot-clean only, while the removable cover can be easily machine-washed.