"Adventure Blanket,” is a quilted blanket intended to be used for protection against the cold while camping, attending sporting events and other outdoor activities. The quilted blanket consists of two outer layers of 20 denier “ripstop” nylon woven textile fabrics which have been treated with a water-resistant coating for protection from rain and inclement weather. Between the two outer layers of 100 percent nylon, the blanket is stuffed with 100 percent polyester batting. The rectangular quilted blanket measures 60 x 70 inches and features four thumb loops along the top and bottom side edges which are designed to make the blanket easier to drape and hold over the shoulders of the user while in a standing or sitting position.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N320607