; such socks with underfoots of breathable neoprene measuring 2.5 to 3 mm in thickness and covered on both sides with a jersey knitted fabric of nylon; the foregoing each formed anatomically so as to be designed for the wearer's left or right foot (provided for in subheading 6115.96.90) Free No change No change On or before 12/31/2020 . 1234. Neoprene guard socks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.13.52 Socks of synthetic fibers, with uppers of neoprene measuring 3.5 mm in thickness and covered on both surfaces with knitted jersey fabric of nylon