Underwear: Fabric: 88% polyester, 12% elastane Lining: 42.5% polyester, 25.2% viscose, 19.2% acrylic, 6.9% elastane, 3.2% cotton, 1.6% mulberry silk, 1.4% cashmere, with Trace Amounts of Other Fibers. Underpants: Main Fabric: 94.9% cotton, 5.1% elastane Gusset: 100% cotton Socks: 62.6% cotton 34.6% polyester 2.8% elastane