Item number: 64409399A is described as a cooling wristband. It is comprised of a silicone wristband and a high-density polyethylene (HDPE) cooling pack containing liquid gel: 97.8% water, 2% glycerin, 0.2% CMC (carboxymethyl cellulose).
The silicone wristband bracelet, resembling a wristwatch but with no time function whatsoever, measures 230 mm long x 25 mm wide and the cooling pack measures 36.1 mm x 23.3 mm. The wristband has a rectangular opening to accept the hard plastic gel pack.----
The consumer places the cooling pack in the freezer for a desired time to cool or freeze the contents. The consumer then inserts the cooling pack into the opening into the wrist strap and wears it as a bracelet with the cooling pack touching their skin.
[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/N322971