Breathable cotton thermal blankets are machine washable and measure 36' x 48". Available single or in a set of four. The assorted set of four includes one each of blue, ecru, green, and white. Choose color.
I bought these blankets for my preschool program. At first they were nice, but after a few washes they shrank significantly. They started as a 36x48 and after a month or so of washing once a week they shrank at least 4-6 inches length and width. These are better suited for toddlers; they would be large at first but then shrink to a size that is still better for the age group.