1)100% merino wool 2)Jersey,Interlock,Rib,Terry,Brushed,Pointelle 3)145gsm ~400gsm 4)4 ... long-wearing for years of comfort.Materials:100% woolFabric construction:Jersey,Interlock,Rib,Terry,Brushed,Pointelle...Fabric weight:120gsm ~400gsmSewing machine ... Looking forward to your specific inquiries. Wool Underwear Men/Women Set