The Hot Chillys Women's Micro-Elite Chamois Print Zip-T is made with a blend of soft MTF (Moisture Transfer Fibers) micro polyester yarns, Bio SilverŪ (silver based) antimicrobial, non-abrasive polyester and spandex for a body fit that stretches and moves with you. The outside of the fabric has a silky feel, while the inside is lightly sanded for added softnesss and that 'chamois' feel. The smooth outside surface makes garments slide over with ease and making this a Best Selling Base Layer!