70% Merino Wool, 27% Nylon, 3% Lycra MADE IN THE USA: DeFeet products are made with Recycled Poly and/or Merino Wool: We've been knitting our socks and apparel in our North Carolina microsockery since 1992. Engineered to be long-lasting, DeFeet products are sustainably manufactured within a local supply chain. Our wool goods are made from USA-grown Merino and our Repreve recycled poly is manufactured right here in North Carolina from locally collected post-consumer water bottles. MERINO WOOL: Woolie Boolies are meticulously crafted from premium Merino wool. Renowned for its fine fibers and natural performance, Merino wool brings a luxurious softness that enhances every step. These socks offer a perfect blend of warmth, breathability, and moisture-wicking, making them an essential choice for all seasons. INSULATED DESIGN: Keep the wind at bay with the Woolie Boolie's insulated toe box, heel pocket, footbed, and front of the sock. Experience warmth where it matters most, ensuring a cozy and protective barrier against the elements. VERSATILITY ACROSS CONDITIONS: Embrace the versatility of the Woolie Boolie—equally suited for winter sports, hiking, or casual wear. Its adaptability makes it the perfect sock for a wide range of activities, ensuring comfort in diverse conditions CUSHIONED COMFORT: Renowned for its cushiness, the Woolie Boolie provides a plush experience with arch support, full foot padding, and top foot padding. Enjoy unparalleled comfort with every step, making these socks a favorite among those who prioritize cushioned support.