... because we use active dyeing. For silk underwear,we can use different silk fabrics like single jersey,double jersey ,jacquard fabrics etc ... ,15gsm in single jersey and 75gsm,90gsm,110gsm,130gsm in double jersey.For all the fabrics,we use 4A aboved yarn to ... produce the fabrics.The quality is high.For dyeing,we use active dyeing to produce. man's silk ...