I selected a 12lb blanket to review but received the 15lb. Recommendations are that the weight should be around 7-10 percent of your body weight, and the size should be just big enough for one person to cocoon themselves in and not have extra hanging off the bed, because then you don't get all the weight on you. If you sleep with someone else, you should each have your own appropriate weight blanket. 48x72 is the size of a large throw. It is ample size for one adult.
I'm 140lbs and feel that the 15lbs is a bit too heavy and would have preferred 12lbs. But my tiny friend slept under it one night when she stayed over, and she loved the weight, so it's personal preference too.
I've been using it alone with a flat sheet on my bed because it's summer and I find it to be very warm.
I have trouble falling asleep and this truly helps me fall asleep FAST. But I've been waking up early, which is not typical, so I think either the weight is too heavy for me, or I'm getting too hot under it in summer, or both.
All materials are polyester and the heavy fill is fine glass beads that feel like sand through the blanket. The fill stays in place well because the blanket is quilted in 4in squares. You can't wash the blanket (spot clean only recommended), so it comes with an all gray duvet cover that is velour on one side and plain weave on the other, and finished beautifully with a hidden zipper- very nice detail! The cover machine washes and dries nicely. The blanket and cover tie together at the corners and middles, so they stay aligned well.
This is from American Textile and made in China.
Tranquility blanket is very high-quality and I highly recommend!