THESE SHORTS ARE MADE FROM A SPECIALLY FORMULATED NYLON THAT HAS THE ABILITY TO BIODEGRADE IN A SHORTER SPACE OF TIME WHEN DISPOSED OF IN OXYGEN-POOR ENVIRONMENTS. THEY HAVE A LIGHTWEIGHT, ORGANIC COTTON JERSEY LINING, WHICH HAS BEEN TREATED WITH OUR TRADEMARK PEPPERMINT OIL (PPRMINT™) TO HELP IT STAY FRESHER FOR LONGER.