TIMBERLAND. TB0A2531001. MENS NEWTONBROOK CHUKKA BOOT. BLACK NUBUCK. Made with recycled and sustainable materials these men s chukkas can be dressed up or down and their rugged good looks only improve with age. Premium leather uppers from a Silver-rated tannery. Linings are ReBotl material which is made using at least 50 percent recycled polyester. Laces are made with 100 percent PET recycled plastic bottles . OrthoLite footbeds. Rubber lug outsoles.